Cognomen Nkak (Nkak 
, กั๊ก) , all over the world, is a rare family name. The cognomen Nkak is characteristic of Cameroon, where it is a rare surname, Nigeria, where it is a very rare surname, and Spain. Measured by absolute frequency, it is the most numerous in Cameroon, Nigeria, and the United States. Much less frequently, Nkak is the forename as well as the last name.