In all the world, Siarhej (Сяргей 
, Siarhej 
) is quite a rare boy's forename. The first name Siarhej is characteristic of Eastern Europe, particularly Belarus, where it is quite a common male name. Very seldom, Siarhej is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Сяргей | Belarus |
| Siarhej | Chile, United States, Belarus |
Serge, Sergei, Sergej, Sergejs, Sergejus, Sergey, Serghei, Sergi, Sergio, Sergios, Sergiu, Sergius, Sergiusz, Serguei, Sergueï, Serguéi, Serhij, Serxio, Siarhei, Siarhiej, Siergiej, Syarhey, Szergej, Sérgio, Σέργιος, Сергей, Сергий, Сергиос, Сергиус, Сергиуш, Сергій, Серджо, Серджу, Серж, Сержи, Сержио, Сержиу, Серхи, Серхио, Серый, Серёга, Сиархей, Сіаргей, סרג'י, סרגיוס, סרגיי, سرجيوس, سيرج, سيرجي, سيرجيو,
Siarhej is also a popular name for the fictitious and mythical characters: Kraven the Hunter , the fictional character in Marvel Comics, The Amazing Spider-Man; Sergey Sergeyevich Skalozub , character in Woe from Wit; Plague Doctor , the supervillain, character of Bubble Comics, Major Grom: Plague Doctor; Sergei Vladimir , the fictional character from Resident Evil, Resident Evil: The Umbrella Chronicles and Sergei Barsov , character in The Spy Who Loved Me, and in many other works.