Last name Грегорин (Gregorin 
, Грегорин) , across the world, is a rare cognomen. The surname Грегорин is characteristic of Slovenia, where it is quite a common surname, Croatia, where it is quite a rare surname, and Switzerland, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Slovenia, Italy, and Brazil. Much less frequently, Грегорин is the forename as well as the last name.