Cognomen Nejak (Nejak 
) , all around the world, is a rare family name. The cognomen Nejak is habitual in Croatia, where it is quite a rare surname, Germany, where it is a very rare surname, and the United States, where it is an extremely rare surname. In absolute terms, the name is most common in Croatia, the United States, and India. Much less frequently, Nejak is the forename as well as the last name.