| Name | Origin | Meaning | Gender |
| Iago | Spanish | Supplanter | male |
| IAIN | gaelic | Gaelic form of John (God is gracious) | male |
| Iain | Scottish | Gift from God | male |
| IAKOVOS | hebrew | supplanter | male |
| Iakovos | Hebrew | Supplanter | male |
| Ian | Scottish | Gift from God Form of John. | male |
| Ian | Hebrew | Gift from God | male |
| IAOKIM | hebrew | God will establish | male |
| Iaokim | Hebrew | God will estahlish | male |
| IAPETUS | greek | myth name (a Titan) | male |
| IASION | greek | myth name (father of Plutus) | male |
| IASIUS | greek | myth name | male |
| IASON | greek | healer | male |
| IBRAHIM | arabic | Arabic form of Abraham (father of many) | male |
| Ibrahim | Arabic | Arabic form of Abraham | male |
| IBYCUS | greek | myth name (a bard) | male |
| ICARIUS | greek | myth name (gave wine to the citizens of Athens who mistook it for poison and killed him) | male |
| ICARUS | greek | myth name (son of Daedalus) | male |
| ICCAUHTLI | nahuatl | younger brother | male |
| ICELOS | greek | myth name (son of Hypnos) | male |
| ICHABOD | hebrew | the glory has departed | male |
| Ichabod | Hebrew | The glory has departed | male |
| ICHIRO | japanese | first son | male |
| ICHTACA | nahuatl | unisexual name meaning "secret." | male |
| ICNOYOTL | nahuatl | unisexual name meaning "friendship." | male |
| IDA | anglo | name of a king | male |
| Ida | Anglo-Saxon | Name of a king | male |
| Idal | English | From the yew tree valley | male |
| IDAS | greek | myth name (an Argonaut) | male |
| IDEN | anglo | wealthy | male |
| IDEN | celtic | wealthy | male |
| Iden | Anglo-Saxon | Wealthy | male |
| Iden | Celtic | Wealthy | male |
| IDI | Africa | Swahili and Muslim name meaning "born during the Muslim holiday of Idd." | male |
| IDOGBE | egyptian | brother of twins | male |
| IDOMENEUS | greek | myth name (a king of Crete) | male |
| IDRIS | arabic | a prophet's name; meaning unknown | male |
| IDRISSA | Africa | Senegal and Gambia name meaning "immortal." | male |
| IFOR | welsh | Of uncertain origin, possibly meaning "lord."Often associated with Norse/Scandinavian Ivor, "bowman". IOAN, IWAN | male |
| Igasho | Native American | Wanders | male |
| IGNACE | french | fiery | male |
| Ignace | French | Fiery | male |
| Ignacy | Russian | | male |
| Ignado | Spanish | Fire | male |
| IGNATIUS | greek | fiery | male |
| Ignazio | Spanish | Fire | male |
| IGORR | greek | farmer | male |
| IHSAN | arabic | beneficence | male |
| IHUICATL | nahuatl | unisexual name meaning "sky." | male |
| Ikaika | Hawaiian | "Strength, strong, powerful, mighty." | male |
| Ike | Hebrew | Variant of Hebrew Isaac Laughter. | male |
| Ike | English | Variant of Hebrew Isaac Laughter. | male |
| IKER | basque | visits | male |
| ILHICAMINA | nahuatl | he shoots arrows at the sky; also name of a great Mexica king | male |
| ILHUITL | nahuatl | unisexual name meaning "day." | male |
| Iliana | Spanish | Variant of Elena. | male |
| Ilias | Hebrew | Jehovah is God | male |
| Illanipi | Native American | Amazing | male |
| ILLIAS | hebrew | Jehovah is God | male |
| Illias | Hebrew | Jehovah is God | male |
| ILMARI | finnish | legend name | male |
| IMAD | arabic | support; pillar | male |
| IMAD al DIN | arabic | pillar of the faith | male |
| IMANOL | hebrew | God is with us | male |
| Imanol | Hebrew | God is with us | male |
| Immanuel | German | Variant of Emanuel With us is God. | male |
| IMRAN | arabic | a prophet's name; meaning unknown | male |
| IMRE | hungarian | innocent | male |
| INA | chamoru | Unisexual name meaning "illuminate; light up." | male |
| INACHUS | greek | myth name (a river god) | male |
| INAKI | basque | ardent | male |
| INAPO | chamoru | wave | male |
| Inazin | Native American | Standing Elk (Stands Sacred) | male |
| Incendio | Spanish | Fire | male |
| INDIA | hindi | Unisexual name meaning "river." INDER, INDRA | male |
| INDIRA | hindi | Unisexual name meaning "splendid." ISWARA | male |
| INE | anglo | name of a king | male |
| Ine | Anglo-Saxon | Name of a king | male |
| Inerney | Irish | Steward of church lands | male |
| Ingall | German | Angel | male |
| Ingalls | German | Angel | male |
| Ingel | German | Angel | male |
| INGELBERT | german | bright angel | male |
| Ingelbert | German | Bright angel | male |
| INGEMAR | scandinavian | Son of Ing.Variants include Ingamar, Ingemur, and Ingmar. INGVAR | male |
| Inglebert | German | "Angel-brilliant, unusually intelligent." | male |
| INI-HERIT | egyptian | he who brings back the distant one | male |
| INIKO | Africa | Efik and Ibibio of Nigeria unisexual name meaning "born amidst civil war" or "born amidst troubled times." | male |
| Inis | Irish | From the river island | male |
| Iniss | Irish | From the river island | male |
| Innes | Scottish | From Innes | male |
| Innes | Irish | From the river island | male |
| Inness | Celtic | From the island | male |
| INNIS | celtic | from the island | male |
| INNIS | gaelic | Scottish name meaning "island." | male |
| INNIS | scottish | Gaelic name meaning "island." IRVIN, IRVING | male |
| Innis | Irish | From the river island | male |
| Innis | Celtic | From the island | male |
| INNOCENT | english | innocent | male |
| Innocent | English | Innocent | male |
| Inocencio | Spanish | Innocent | male |
| Inocente | Spanish | Innocent | male |
| Inteus | Native American | Has no shame | male |
| Inys | Irish | From the river island | male |
| IOACHIME | russian | Variant of Ioakim, "God will judge." | male |
| IOAKIM | russian | Russian form of Hebrew Joachim, "God will judge."Variant, Ioachime, exists. Diminutive is Iov. | male |
| IOAN | romanian | gift from God | male |
| Ioan | Hebrew | Gift from God | male |
| IOBATES | greek | myth name | male |
| IOMAR | gaelic | archer | male |
| ION | greek | myth name (son of Apollo) | male |
| Ionnes | Hebrew | Gift from God | male |
| IORWERTH | welsh | handsome lord; son of Maredudd in legend. | male |
| Iosep | Hebrew | God will multiply | male |
| IOSEPH | hebrew | God will multiply | male |
| Ioseph | Hebrew | God will multiply | male |
| Iov | Hebrew | God will estahlish | male |
| IPHICLES | greek | myth name (Hercules' twin brother) | male |
| IPHIS | greek | myth name (hanged himself over unrequited love) | male |
| IPHITUS | greek | myth name (brother of Iole) | male |
| IRA | hebrew | descendant | male |
| Ira | Hebrew | Descendant | male |
| IRENBEND | anglo | iron bend | male |
| Irenbend | Anglo-Saxon | Iron bend | male |
| IRFAN | arabic | thankfulness | male |
| IRUS | greek | myth name (challenged Odysseus on his return to Ithaca) | male |
| Irven | English | Friend. See also Ervin. | male |
| Irven | Celtic | White | male |
| IRVIN | celtic | white | male |
| Irvin | Celtic | White | male |
| Irvin | Scottish | From the city | male |
| Irvin | English | Friend. See also Ervin. | male |
| Irvine | English | Friend. See also Ervin. | male |
| IRVING | english | sea friend | male |
| IRVING | gaelic | handsome | male |
| Irving | English | Friend. See also Ervin. | male |
| Irving | Celtic | White | male |
| Irving | Scottish | From the city | male |
| Irvyn | Celtic | White | male |
| Irvyn | English | Friend. See also Ervin. | male |
| IRWIN | anglo | sea lover | male |
| Irwin | Anglo-Saxon | Sea lover | male |
| Irwin | English | Sea friend | male |
| Irwyn | English | Sea friend | male |
| Irwyn | Anglo-Saxon | Sea lover | male |
| ISA | arabic | Jesus | male |
| ISAAC | hebrew | child of laughter | male |
| Isaac | Hebrew | Laughter. In the bible the only son of Abraham by his wife Sarah. The great violinist Itzhak Perlman. | male |
| Isaakios | Hebrew | Child of laughter | male |
| Isadoro | Spanish | strong gift. | male |
| Isaiah | Hebrew | God's helper | male |
| Isaias | Hebrew | God's helper | male |
| Isaias | Spanish | Salvation of Jehovah. | male |
| ISAM | arabic | safeguard | male |
| Isdemus | Arthurian Legend | Knight of Arthur | male |
| ISDERNUS | arthurian | knight of Arthur | male |
| ISEABAIL | hebrew | devoted to God | male |
| Iseabail | Hebrew | Devoted to God | male |
| ISEN | anglo | iron | male |
| Isen | Anglo-Saxon | Iron | male |
| Isenham | English | From the iron one's estate | male |
| ISHAM | english | from the iron one's estate | male |
| Isham | English | From the iron one's estate | male |
| ISHAQ | arabic | a prophet's name; meaning unknown | male |
| ISHAQ | egyptian | laughs | male |
| Ishmael | Hebrew | God listens. In the bible Ismael was son of Abraham by Sarah's Egyptian slave woman Hagar. | male |
| Ishmael | Spanish | God listens. In the bible Ismael was son of Abraham by Sarah's Egyptian slave woman Hagar. | male |
| ISIAH | hebrew | God's helper | male |
| Isiah | Hebrew | God's helper | male |
| ISIDORE | greek | strong gift | male |
| Isidoro | Spanish | Gifted with many ideas | male |
| Isidro | Spanish | Gifted with many ideas | male |
| ISKINDER | Africa | Amharic of Ethiopia version of Greek name Alexander meaning "defender of mankind." | male |
| ISMA'IL | arabic | a prophet's name; meaning unknown | male |
| Ismael | Spanish | God listens. In the bible Ismael was son of Abraham by Sarah's Egyptian slave woman Hagar. | male |
| Ismael | Hebrew | God listens. In the bible Ismael was son of Abraham by Sarah's Egyptian slave woman Hagar. | male |
| ISRA'IL | arabic | meaning unknown | male |
| Israel | Hebrew | God perseveres: contends. In the bible when Jacob was in his nineties as a token of blessing God changed his name to Israel. | male |
| ISREAL | hebrew | ruling with the Lord | male |
| Isreal | Hebrew | Ruling with the Lord | male |
| ISSA | Africa | Swahili and Muslim name meaning "the Messiah." | male |
| ISSA | egyptian | God saves | male |
| Issiah | Unknown | | male |
| ISTAQA | native | Hopi name meaning " coyote man." INTEUS | male |
| Istaqa | Native American | Coyote man (Hopi) | male |
| Istu | Native American | Sugar | male |
| ISTVAN | greek | victorious | male |
| ISTVAN | hungarian | Hungarian form of Stephen, "crowned." | male |
| ITAI | hebrew | friendly | male |
| Itai | Hebrew | Friendly | male |
| ITHER | arthurian | killed by Percival | male |
| Ither | Arthurian Legend | Killed by Percival | male |
| ITOTIA | nahuatl | unisexual name meaning "dance." | male |
| ITTAMAR | hebrew | island of palms | male |
| Ittamar | Hebrew | Island of palms | male |
| ITZ JAMES | english | son of James | male |
| Itzcali | Aztec | House of Beauty | male |
| ITZIK | yiddish | humorous KYLE | male |
| ITZTLI | nahuatl | obsidian; obsidian knife | male |
| IUITL | nahuatl | unisexual name meaning "feather." | male |
| IULIAN | romanian | youthful | male |
| IUSTIG | welsh | legend name (son of Caw) KAY | male |
| IUWINE | anglo | friend | male |
| Iuwine | Anglo-Saxon | Friend | male |
| IVAN | greek | glorious gift | male |
| IVAN | hebrew |
gift from God
JACOB, JACK, JOCK,
JAKE, JACOBE, JAMES, JIM, JAMIE,
JIMMY, JEM, JAKOME, JAQUES, JACOT,
JAAP, JOV | male |
| IVAN | romanian | God is gracious | male |
| IVAN | russian | Russian form of John (gracious gift from God)
JASHA | male |
| Ivan | Spanish | Archer | male |
| Ivan | Hebrew | Gift from God | male |
| IVANTIE | romanian | glorious gift | male |
| Ivar | English | Archer's bow. | male |
| IVEN | french | little archer | male |
| Iven | French | Little archer | male |
| Iver | Scottish | Archer | male |
| IVES | english | little archer | male |
| Ives | English | Archer's bow. Variant of Yves from Ivar. | male |
| Ivey | English | A climbing evergreen ornamental plant. | male |
| Ivo | English | Archer's bow. | male |
| Ivon | English | Archer's bow. | male |
| IVOR | norse | Norse or Scandinavian name meaning "bowman."Sometimes associated with Welsh Ifor, "lord."Variants include Ivar and Iver. | male |
| IVOR | scandinavian | Norse or Scandinavian name meaning "bowman."Sometimes associated with Welsh Ifor, "lord."Variants include Ivar and Iver. | male |
| Ivor | English | Archer's bow. | male |
| IWDAEL | english | from the yew-tree valley | male |
| Iwdael | English | From the yew tree valley | male |
| IXAKA | basque | laughs | male |
| Ixaka | Hebrew | Child of laughter | male |
| IXION | greek | myth name (father of the centaurs) JACINTO | male |
| IXTLI | nahuatl | unisexual name meaning "face." | male |
| Iyanuoluwa | Unknown | Gods miracle | male |
| Iye | Native American | Smoke | male |
| IyiOluwa | Yoruba | The honor of the Lord of the universe | male |
| Izaak | German | Laughter. | male |
| Izaak | Hebrew | Child of laughter | male |
| Izaan | Muslim | Obedience. | male |
| IZMIRLIAN | armenian | from Izmir | male |
| Izreal | Hebrew | Ruling with the Lord | male |
| IZSAK | hungarian | Hungarian form of Isaac (laughter) | male |
| IZZ al DIN | arabic | might of the faith | male |