Cognomen ปิยะรัตนโยธิน (ปิยะรัตนโยธิน 
, Piyarattanayothin , Piyarattanayotin ) , in the world, is a very rare last name. The surname ปิยะรัตนโยธิน is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| ปิยะรัตนโยธิน, Piyarattanayothin, Piyarattanayotin, Piyaratanayothin | Thailand |