Surname ฤทธิรณ (Power 
, ฤทธิรณ 
, Rittiron ) , all around the world, is a common family name. The cognomen ฤทธิรณ 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). In absolute terms, it is commonest in the United States, the United Kingdom, and Canada. Very seldom, ฤทธิรณ is the forename as well as the last name.