Last name เพ็ญบุญ (เพ็ญบุญ 
, Penboon 
, Penbun ) , worldwide, is a rare family name. The cognomen เพ็ญบุญ is habitual in Thailand, where it is a rare surname, Norway, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, เพ็ญบุญ is the forename as well as the last name.