Family name รัตนพันธ์ุ (รัตนพันธ์ุ 
) , all over the world, is an extremely rare cognomen. The family name รัตนพันธ์ุ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| รัตนพันธ์ุ | Thailand |