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Last name Welo (Welo , สวัสดี , Abuelo ) , all over the world, is a common family name. The cognomen Welo is habitual in Thailand, where it is quite a common surname, Norway, where it is quite a rare surname, and Ethiopia, where it is a rare surname. Measured by absolute frequency, it is commonest in Thailand, Ethiopia, and Philippines. Much less frequently, Welo is the forename as well as the last name.