Family name Sergej (Сергей 
, Sergej 
, セルゲイ 
) , around the globe, is a widespread cognomen. The surname Sergej is habitual in Armenia, where it is a common surname, Kyrgyzstan, and Moldova (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Russia, Kyrgyzstan, and Belarus. Much more frequently, Sergej is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Сергей | Azerbaijan, Kazakhstan, Russia, Belarus, Ukraine |
| Sergej | Germany, Russia, Belarus, Serbia, Moldova |
| セルゲイ | Japan |
| سيرجي | Yemen, Palestinian Territory |
S., Serge, Sergei, Sergejs, Sergejus, Sergey, Serghei, Sergi, Sergiej, Sergio, Sergios, Sergiu, Sergius, Sergiusz, Serguei, Sergueï, Serguéi, Sergéi, Serhii, Serhij, Serhiy, Serhiï, Serxio, Siarhei, Siarhej, Siarhiej, Siergiej, Srđan, Syarhey, Szergej, Sérgio, Σέργιος, Сергеж, Сергеи, Сергий, Сергиос, Сергиус, Сергиуш, Сергэй, Сергій, Серджо, Серджу, Серж, Сержи, Сержио, Сержиу, Серхи, Серхий, Серхио, Серый, Серёга, Срджан, Сяргей, סרג'י, סרגיוס, סרגיי, سرجيوس, سيرج, سيرجى, سيرجيو, سيرغي, スルタン, セルジョ, セルヒオ, and 塞登
Moor, Lorenz, Ivanov, Wagner, Müller, Sergeev, Sokolov, Schmidt, Schwarz, Smirnov, Golban, Krieger, Novikov, Neumann, Hermann, Friesen, Fischer, Schäfer, Hoffmann, Vasiljev, Schneider, Klassen, Ritter, Petrov, Pavlov, Berg, Koch, Kunz, Root, Dick, Wolf, Maier, Meier, Bauer, Belov, Braun, Klein, Popov, Vogel, Frank, Weber, Miller, Michel, Schulz, Becker, Keller, Ponomarev, and Zimmermann