Cognomen Σέργιος (Sergius 
, Serxhio 
, Σέργιος ) , around the world, is quite a rare family name. The cognomen Σέργιος is characteristic of Nigeria, where it is a rare surname, Uganda, and Malaysia. Measured by absolute frequency, it most frequently occurs in Nigeria, Indonesia, and Uganda. More frequently, Σέργιος is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sergius | Nigeria, Democratic Republic of the Congo, Germany, Indonesia, Uganda |
| Serxhio | Greece, Albania, United Kingdom, United States, Italy |
| Σέργιος | Greece |
Serge, Sergei, Sergej, Sergejs, Sergejus, Sergey, Serghei, Sergi, Sergio, Sergios, Sergiu, Sergiusz, Serguei, Sergueï, Serguéi, Serhij, Serxio, Siarhei, Siarhej, Siarhiej, Siergiej, Srđan, Syarhey, Szergej, Sérgio, Сергей, Сергий, Сергиос, Сергиус, Сергиуш, Сергій, Серджо, Серджу, Серж, Сержи, Сержио, Сержиу, Серхи, Серхио, Серый, Серёга, Срджан, Сяргей, סרג'י, סרגיוס, סרגיי, سرجيوس, سيرج, سيرجي, سيرجيو, سيرغي, スルタン, セルゲイ, セルジョ, セルヒオ, and 塞登