Oleynik

Oleynik is a Slavic surname used in Russia, Ukraine, and Belarus. It is commonly transliterated as Oleynik, Oleinik, Olenik, or Olenyk, reflecting variations in Cyrillic-to-Latin renderings. The name is typically patronymic or possessive in origin, formed with a suffix such as -ik or -nik attached to a base personal name or nickname.

Within Slavic naming traditions, the base may derive from a given name such as Oleg or Olen, though regional forms differ. The surname is found among diaspora communities in North America and Western Europe, where transliteration and spelling norms have produced multiple variants.

Notable individuals with the surname include Alexey Oleynik (born 1977), a Russian mixed martial artist known for competing in major international promotions. He has held titles and achieved recognition in Combat Sambo as well as in heavyweight divisions of mixed martial arts.

Beyond this, bearers of the name appear in various fields such as science, literature, and sports, reflecting the broad geographic distribution of the surname.