Cognomen ขวัญเพ็ญ (ขวัญเพ็ญ 
, Kwanpen ) , in the world, is a very rare surname. The last name ขวัญเพ็ญ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, ขวัญเพ็ญ is the forename as well as the last name.