Cognomen ฤทธิคง (ฤทธิคง 
, Ritthkong ) , around the globe, is a very rare surname. The last name ฤทธิคง is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิคง, Ritthkong | Thailand |
Matthew, and Rittikhong