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Last name Klay (Klay , 克雷 , كلاي ) , all around the world, is a common surname. The surname Klay is characteristic of Switzerland, where it is quite a common surname, Tunisia, and Myanmar, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Egypt, Myanmar, and Sudan. Likewise, Klay is the forename as well as the last name.