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Cognomen Klai (Klai , กลาย , กล้าย) , around the globe, is quite a common last name. The family name Klai is characteristic of Tunisia, where it is quite a common surname, Algeria, where it is quite a rare surname, and Oman, where it is a rare surname. Measured by absolute frequency, it is commonest in Tunisia, Algeria, and France. Much less frequently, Klai is the forename as well as the last name.