| Yulian | | - | Russian, Bulgarian | |
| Yuliana | | - | Russian, Bulgarian, Indonesian | |
| Yuliya | | YOO-lee-yah (Russian) | Russian, Ukrainian, Bulgarian | |
| Zahari | | - | Bulgarian | |
| Zaharina | | - | Bulgarian, Macedonian | |
| Zaharinka | | - | Bulgarian, Macedonian | |
| Zara (2) | | - | Bulgarian | |
| Zdravko | | - | Croatian, Serbian, Slovene, Bulgarian, Macedonian | |
| Zhaklina | | - | Macedonian, Bulgarian | |
| Zhelyazko | | - | Bulgarian | |
| Zhenya | | - | Russian, Bulgarian | |
| Zhivka | | - | Bulgarian, Macedonian | |
| Zhivko | | - | Bulgarian, Macedonian | |
| Zlatan | | - | Croatian, Serbian, Bosnian, Macedonian, Bulgarian, Slovene | |
| Zlatko | | - | Croatian, Serbian, Slovene, Bulgarian, Macedonian | |