| 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 | |
| Xenon | | - | Ancient Greek | |
| Xenophon | | - | Ancient Greek | |
| Yeshua | | - | Biblical Hebrew, Ancient Aramaic | |
| Yngvarr | | - | Ancient Scandinavian | |
| Yngvildr | | - | Ancient Scandinavian | |
| Zarathushtra | | - | Ancient Persian | |
| Zenais | | - | Ancient Greek | |
| Zeno | | - | Ancient Greek (Latinized), Italian | |