Surname Sumak (Sumak 
, Сумак 
) , throughout the world, is a rare family name. The cognomen Sumak is characteristic of Slovenia, where it is quite a rare surname, Belarus, where it is a rare surname, and Syria. Not in comparison with a country's population, it most frequently occurs in Turkey, Slovenia, and Russia. Much less frequently, Sumak is the forename as well as the last name.