Cognomen รัตนิพนธ์ (รัตนิพนธ์ 
) , worldwide, is a very rare family name. The family name รัตนิพนธ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, รัตนิพนธ์ is the forename as well as the last name.