Family name Kusumarn (Kusumarn 
) , worldwide, is a very rare surname. The family name Kusumarn is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Kusumarn is the forename as well as the last name.
Onsri, Thongkanloung, Pramongkon, Prasertsri, Kumkhuntod, Kaewsuntronchai, Phruekhiran, Pongjampa, Chayanon, Pattanayaiying, Ophartnawakhun, Nokkaew, Nounpolklang, Janplee, Larluang, Raruenklin, Rakpaitoon, Noipha, Srikul, Fleming, and Chaijumroonpun