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Surname Thain (Thain
, 塞恩
, Тейн
) , worldwide, is quite a common last name. The surname Thain is characteristic of Myanmar, where it is quite a rare surname, Cyprus, and the United Kingdom. Measured by absolute frequency, it is the most numerous in Myanmar, the United Kingdom, and the United States. Also, Thain is the forename as well as the last name.