Cognomen Tosko (Tosko 
, Тоско 
) , throughout the world, is a very rare surname. The surname Tosko is characteristic of Bulgaria, where it is a rare surname, Israel, where it is a very rare surname, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in the United States, Bulgaria, and the United Kingdom. Likewise, Tosko is the forename as well as the last name.