| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| UGO | - | Italian | ||
| UILANI | - | Hawaiian | ||
| UILLEAG | - | Irish | ||
| UILLEAM | - | Scottish | ||
| UILLIAM | - | Irish | ||
| UINSEANN | - | Irish | ||
| UJARAK | - | Native American, Inuit | ||
| U-JIN | oo-jeen | Korean | ||
| UKALEQ | - | Native American, Greenlandic | ||
| UKKO | OOK-ko (Finnish) | Finnish, Finnish Mythology | ||
| ULA | - | Polish | ||
| ULADZIMIR | - | Belarusian | ||
| ULDERICO | - | Italian | ||
| ULF | - | Swedish, Norwegian, Danish | ||
| ULIANA | - | Russian |