Last name Кастор (Castor 
, Kastor , Càstor 
) , throughout the world, is a common family name. The family name Кастор is characteristic of Philippines, where it is quite a common surname, Haiti, where it is quite a rare surname, and Spain. In absolute terms, it is the most numerous in Philippines, the United States, and Brazil. Much less frequently, Кастор is the forename as well as the last name.