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Cognomen Soai (Soai , ซอย ) , all over the world, is a rare family name. The cognomen Soai is characteristic of Lesotho, where it is quite a rare surname, Malaysia, where it is a rare surname, and South Africa, where it is a very rare surname. In absolute terms, the name is most common in Lesotho, Japan, and Vietnam. Likewise, Soai is the forename as well as the last name.