| Sergei | | syer-GYAY (Russian), seer-GYAY (Russian) | Russian, Bulgarian | |
| Sergej | | syer-GYAY (Russian), seer-GYAY (Russian) | Russian, Bulgarian | |
| Sergey | | syer-GYAY (Russian), seer-GYAY (Russian) | Russian, Bulgarian | |
| Serghei | | - | Romanian | |
| Sergi | | - | Catalan | |
| Sergio | | SER-jo (Italian), SER-khyo (Spanish) | Italian, Spanish | |
| Sergiu | | - | Romanian | |
| Sergius | | - | Ancient Roman | |
| Serhiy | | - | Ukrainian | |
| Serik | | - | Kazakh | |
| Serrena | | sə-REEN-ə | English (Rare) | |
| Servatius | | - | Late Roman | |
| Servius | | SER-wi-uws | Ancient Roman | |
| Sesto | | - | Italian | |
| Set | | SET (English), SAYT (English) | Egyptian Mythology (Hellenized) | |