Family name וולקו (Valko 
, וולקו 
) , in the entire world, is quite a rare cognomen. The family name וולקו is habitual in Slovakia, where it is quite a common surname, Cayman Islands, where it is quite a rare surname, and Cyprus. Measured by absolute frequency, it is the most numerous in Slovakia, Hungary, and the United States. Much less frequently, וולקו is the forename as well as the last name.