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Family name ฤทธิคุณ (ฤทธิคุณ , Rittikhun , Ritthikhun ) , in all the world, is a very rare cognomen. The surname ฤทธิคุณ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, ฤทธิคุณ is the forename as well as the last name.
กฤษฎิ์, สุระศักดิ์, and เกียรติพงศ์