Surname ฤทธิ์กล้า (Power 
, ฤทธิ์กล้า) , around the globe, is a common last name. The surname ฤทธิ์กล้า is characteristic of Ireland, where it is a common surname, Guernsey, where it is quite a common surname, and Australia (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in the United States, the United Kingdom, and Canada. Very seldom, ฤทธิ์กล้า is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Power | United Kingdom, United States, Ireland, Australia, Canada |