| Willahelm | | - | Ancient Germanic | |
| Willamar | | - | Ancient Germanic | |
| Willifrid | | - | Ancient Germanic | |
| Willihard | | - | Ancient Germanic | |
| Winifrid | | - | Ancient Germanic | |
| Wolf | | WUWLF (English) | German, Jewish, English (Rare), Ancient Germanic | |
| Wolfgang | | VAWLF-gahng (German), WUWLF-gang (English) | German, Ancient Germanic | |
| Xanthe | | - | Greek Mythology, Ancient Greek | |
| Xanthippe | | ksahn-teep-pe (Ancient Greek), zan-TIP-ee (English) | Ancient Greek | |
| Xanthippos | | - | Ancient Greek | |
| Xanthos | | - | Greek Mythology, Ancient Greek | |
| Xenia | | - | Greek, Ancient Greek | |
| Xeno | | - | Ancient Greek | |
| Xenocrates | | zi-NAH-krə-teez (English) | Ancient Greek (Latinized) | |
| Xenokrates | | - | Ancient Greek | |