| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 901 | Tudor | Welsh | God's gift. | M | |
| 902 | Twm | Welsh | Welsh form of Tom 'gift from God'. | M | |
| 903 | Twrgadarn | Welsh | Tower of stlength. | M | |
| 904 | Tywysog | Welsh | Prince. | M | |
| 905 | Uchdryd | Welsh | Legendary son of Erim. | M | |
| 906 | Una | Welsh | White wave. | F | |
| 907 | Vaddon | Welsh | From Bath. | M | |
| 908 | Vala | Welsh | Chosen. | F | |
| 909 | Vanora | Welsh | White wave. | F | |
| 910 | Vaughan | Welsh | Little. | M | |
| 911 | Vaughn | Welsh | Variant of Vaughan: Little. | M | |
| 912 | Vonn | Welsh | Little. | M | |
| 913 | Vontell | Welsh | Little. | M | |
| 914 | Vorath | Welsh | Variant of Iorwerth: Worthy lord. Derived from 'ior' and 'gwerth'. Legendary son of Maredudd. | M | |
| 915 | Vychan | Welsh | Small. | M | |
| 916 | Wadu | Welsh | Legendary son of Seithved. | M | |
| 917 | Waljan | Welsh | Chosen. | M | |
| 918 | Win | Welsh | Diminutive of Winifred: Blessed reconciliation. | F | |
| 919 | Winefred | Welsh | White wave. Also a variant of Winifred: Blessed reconciliation. | F | |
| 920 | Winifred | Welsh | Reconciled; blessed. Historically Winifred was a martyred Welsh princess; traditionally the patron saint of virgins. | F | |