Siarhei, Siarhiej, Syarhei, or Syarhey is a Belarusian transcription of the Slavic masculine given name Sergey. Notable persons with the name include:Siarhei Charnou, Belarusian race walker Siarhiej Dubaviec, Belarusian journalist Siarhei Kukharenka, Belarusian judoka Siarhei Lahun (1988–2011), Belarusian weightlifter Siarhei Navumchyk, Belarusian journalist and politician Siarhei Novikau, Belarusian judoka Syarhei Parsyukevich, Belarusian small business owner Siarhei Rutenka, Spanish handball player Siarhei Shundzikau, Belarusian judoka Siarhei Tsikhanouski, Belarusian dissident