Cognomen Sumonmal (Sumonmal 
) , in all the world, is an extremely rare family name. Much more prevalently, Sumonmal is the forename as well as the last name.
Samatin, Sudtankaew, Kerdyoo, Chailikit, Thongkur, Torsakul, Manusirivithaya, Thongjeen, Nakarawong, Uttayamakul, Surasingtothong, Jantarasuwan, Duangsungnoen, and Wittayapairoj