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Last name สมทรัพย์ (สมทรัพย์ , Somsap , Somsub ) , in all the world, is quite a rare surname. The family name สมทรัพย์ is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname. Also, สมทรัพย์ is the forename as well as the last name.