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Surname Phen (เพ็ญ , Phen , เพ็น ) , across the world, is quite a rare last name. The last name Phen is characteristic of Bermuda, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Hong Kong. Measured by absolute frequency, this name is the most popular in South-eastern Asia, particularly Indonesia, Malaysia, and Myanmar. More frequently, Phen is the forename as well as the last name.