Cognomen Somthob (Somthob 
) , in the world, is an extremely rare last name. The cognomen Somthob is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more frequently, Somthob is the forename as well as the last name.
Maknu, Withithammasak, Phutthaniyom, Thongchua, Laoniyomthai, Phiokhamdi, Bunsuaykhwan, Manaswarowong, Padmadilok, Chamniankarn, Sayamchai, Chairat, Aiamserm, Seeoonsaeng, Impoka, Junpan, Aebsaphap, Montha, Dapee, Chritpakorn, and Khongprasoet