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Last name Thay (Thay , Тхаы ) , all over the world, is quite a common surname. The last name Thay is habitual in South-eastern Asia, particularly Myanmar, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Singapore. Measured by absolute frequency, it is commonest in South-eastern Asia, particularly Myanmar, Malaysia, and Indonesia. Also, Thay is the forename as well as the last name.