Last name Stoylov (Stoylov, Стоилов 
, Стойлов 
) , all around the world, is quite a rare family name. The family name Stoylov is characteristic of Bulgaria, where it is quite a common surname, Russia, where it is a rare surname, and Kazakhstan, where it is a very rare surname. In absolute terms, it most frequently occurs in Eastern Europe, particularly Bulgaria, Russia, and Ukraine.