Cognomen Ilhak (Ilhak 
) , in the entire world, is a rare family name. The last name Ilhak is habitual in Indonesia, where it is a very rare surname, France, where it is an extremely rare surname, and Turkey. Not in comparison with a country's population, this name is the most popular in Indonesia, India, and China. More prevalently, Ilhak is the forename as well as the last name.