Last name ฤทธิวรรณ (ฤทธิวรรณ 
, Ruttiwan , Ritthiwan ) , in all the world, is a rare cognomen. The family name ฤทธิวรรณ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, ฤทธิวรรณ is the forename as well as the last name.