Cognomen โรจน์ณรงค์ (โรจน์ณรงค์ 
, Rojnarong ) , globally, is a rare family name. The cognomen โรจน์ณรงค์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, โรจน์ณรงค์ is the forename as well as the last name.