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Family name พิกุลรัตน์ (พิกุลรัตน์ , Phikulrat , Pikulrat ) , all over the world, is a rare surname. The cognomen พิกุลรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Also, พิกุลรัตน์ is the forename as well as the last name.