| Name | Origin | Meaning | Gender |
| Uaid | Irish | Irish form of Walter | male |
| Ualtar | Irish | Strong fighter | male |
| UBADAH | arabic | servant of God | male |
| UBAID | arabic | faithful | male |
| UBAID | egyptian | faithful | male |
| UBAYY | arabic | old Arabic name; meaning unknown | male |
| UBEL | german | evil | male |
| Ubel | German | Evil | male |
| UCHDRYD | celtic | myth name (Crossbeard) | male |
| UCHECHI | Africa | Ibo of Nigeria name meaning "God's will." | male |
| Udale | English | From the yew tree valley | male |
| Udall | English | From the yew tree valley | male |
| Udayle | English | From the yew tree valley | male |
| UDELL | english | from the yew-tree valley | male |
| Udell | English | From the yew tree valley | male |
| UDO | japanese | ginseng plant | male |
| UDOLF | english | wealthy wolf | male |
| Udolf | English | Wealthy wolf | male |
| Udolph | English | Wealthy wolf | male |
| UEMAN | nahuatl | venerable time | male |
| UETZCAYOTL | nahuatl | the essence of light | male |
| UFA | egyptian | flour | male |
| UGUTZ | basque | name for John the Baptist | male |
| UILLEAM | gaelic | helmeted | male |
| UISDEAN | gaelic | intelligent | male |
| UISNECH | celtic | meaning unknown | male |
| ULFRED | english | wolf of peace | male |
| Ulfred | English | Wolf of peace | male |
| ULGER | english | wolf spear | male |
| Ulger | English | Wolf spear | male |
| Uli | German | Noble leader | male |
| Ulises | Spanish | Variant of the Greek name Odysseus. Ulysses was the clever and resourceful mythological hero of Homer's epic The Odyssey. | male |
| ULLOCK | english | wolf sport | male |
| Ullock | English | Wolf sport | male |
| Ullok | English | Wolf sport | male |
| ULMAR | english | wolf famous | male |
| Ulmar | English | Wolf famous | male |
| Ulmarr | English | Wolf famous | male |
| ULRICH | german | noble leader | male |
| Ulrich | German | Noble leader | male |
| ULRIK | danish | ruler of all | male |
| Ulvelaik | English | Wolf sport | male |
| ULYSSES | greek | wrathful | male |
| Ulz | German | Noble leader | male |
| UMAR | arabic | name of the second Khalifa | male |
| UMARAH | arabic | old Arabic name; meaning unknown | male |
| UMAYR, | arabic | old Arabic name; meaning unknown | male |
| UMI | egyptian | life | male |
| UMIT | turkish | hope | male |
| UNAI | basque | shepherd | male |
| Ungus | Irish | One vigor | male |
| UNIKA | egyptian | meaning unknown | male |
| UNWIN | english | unfriendly | male |
| Unwin | English | Unfriendly | male |
| Unwine | English | Unfriendly | male |
| Unwyn | English | Unfriendly | male |
| UPCHURCH | english | from the upper church | male |
| Upchurch | English | From the upper church | male |
| UPTON | anglo | from the high town | male |
| UPTON | english | from the upper farm | male |
| Upton | Anglo-Saxon | From the high town | male |
| Upton | English | From the upper farm | male |
| Uptun | English | From the upper farm | male |
| Upwode | English | From the upper forest | male |
| UPWOOD | english | from the upper forest | male |
| Upwood | English | From the upper forest | male |
| UR-ATUM | egyptian | myth name (great) | male |
| URANUS | greek | myth name (sky) | male |
| Urbano | Spanish | From the city | male |
| Uri | Hebrew | God is my light | male |
| URIAH | hebrew | God is my light | male |
| Uriah | Hebrew | God is my light | male |
| URIAN | greek | from heaven | male |
| Uriel | Hebrew | God is my light | male |
| Urien | Arthurian Legend | Name of a king | male |
| URIENS | arthurian | name of a king | male |
| Uriens | Arthurian Legend | Name of a king | male |
| Uriyah | Hebrew | god is my light | male |
| Urquhart | Scottish | From the fount on the knoll | male |
| URS | swiss | from Latin "ursus", the bear | male |
| URTZI | basque | sky | male |
| USAMA | arabic | description of a lion | male |
| Usbeorn | English | Divine warrior | male |
| USI | egyptian | smoke | male |
| USK-WATER | celtic | meaning unknown | male |
| UTBAH | arabic | old Arabic name; meaning unknown | male |
| UTHER | arthurian | Arthur's father | male |
| Uther | Arthurian Legend | Arthur's father | male |
| UTHMAN | arabic | one of the companions of the prophet | male |
| UTHMAN | egyptian | a friend of Muhammad | male |
| Utkarsh | India | Advancement -- to rise | male |
| UWAINE | arthurian | meaning unknown | male |
| UZUMATI | native | Miwok name meaning " bear." | male |
| Uzumati | Native American | Bear (Miwok) | male |
| Uzziah | Hebrew | God is mighty | male |
| UZZIEL | hebrew | God is mighty | male |
| Uzziel | Hebrew | God is mighty | male |