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Family name แก้วเก้า (Kaewkao , แก้วเก้า, Kaewnai ) , throughout the world, is a rare last name. The cognomen แก้วเก้า is habitual in Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname. Very seldom, แก้วเก้า is the forename as well as the last name.