Last name รัตนาพันธุ์ (รัตนาพันธุ์ 
) , in the entire world, is a very rare family name. The surname รัตนาพันธุ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, รัตนาพันธุ์ is the forename as well as the last name.