Family name ฤทัยธรรมรงค์ (ฤทัยธรรมรงค์ 
) , around the globe, is an extremely rare surname. The last name ฤทัยธรรมรงค์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ฤทัยธรรมรงค์ | Thailand |