Family name ฤทัยวัฒนากุล (ฤทัยวัฒนากุล 
) , around the globe, is a very rare last name. The cognomen ฤทัยวัฒนากุล is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ฤทัยวัฒนากุล | Thailand |