Cognomen تاجک (Tajuk 
, تاجک 
) , around the world, is quite a rare surname. The cognomen تاجک is habitual in Afghanistan, where it is quite a rare surname, Iran, where it is a rare surname, and Saudi Arabia, where it is a very rare surname. In absolute terms, it is commonest in Afghanistan, Iran, and Indonesia. Very seldom, تاجک is the forename as well as the last name.