Last name ฤทธิศรธนู (ฤทธิศรธนู 
, Rithisornthanu , Rittisorntanoo ) , all over the world, is a rare cognomen. The last name ฤทธิศรธนู is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rithisornthanu, ฤทธิศรธนู, Rittisorntanoo, Ritthisornthanu | Thailand |