Cognomen Лашак (Lashak 
, Лашак 
, Lašák 
) , around the world, is a rare family name. The cognomen Лашак is characteristic of Slovakia, where it is quite a rare surname, Czechia, where it is a rare surname, and Argentina, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Slovakia, Czechia, and the United States. Very seldom, Лашак is the forename as well as the last name.