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Last name Hah (Hah , هاه , Хах ) , around the world, is quite a common cognomen. The last name Hah is characteristic of Brunei, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Mauritius. Measured by absolute frequency, the name is most common in Malaysia, South Korea, and Saudi Arabia. Very seldom, Hah is the forename as well as the last name.