| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Wilky | - | Medieval English | ||
| Wilmot | - | Medieval English | ||
| Wybert | - | Medieval English | ||
| Wymond | - | Medieval English | ||
| Wyot | - | Medieval English | ||
| Ximeno | - | Medieval Spanish | ||
| Yarognev | - | Medieval Slavic | ||
| Yaromil | - | Medieval Slavic (Hypothetical) | ||
| Yaromir | - | Medieval Slavic | ||
| Yaropolk | - | Medieval Slavic | ||
| Yaroslav | yah-rah-SLAHF (Russian) | Russian, Ukrainian, Medieval Slavic | ||
| Yaroslava | yah-rah-SLAH-vah (Russian) | Russian, Ukrainian, Medieval Slavic | ||
| Yrian | - | Medieval Scandinavian | ||
| Zbignev | - | Medieval Slavic | ||
| Zdislav | - | Czech, Medieval Slavic |