Cognomen Sun-Ja (순자 
, 선자 , Sun-Ja 
) , throughout the world, is an extremely rare surname. The last name Sun-Ja is habitual in Northern America, particularly the United States, where it is an extremely rare surname. Predominantly, Sun-Ja is the forename as well as the last name. Parts of the name also exists independently as a last name Sun, and a first name Ja.