Surname Ерсои (Ersoy 
, Ерсои 
) , around the world, is a common family name. The last name Ерсои is habitual in Turkey, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Austria. Measured by absolute frequency, it most frequently occurs in Turkey, Germany, and Austria. Much less frequently, Ерсои is the forename as well as the last name.