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Last name Umai (Umai , Умай , อุมัย ) , throughout the world, is quite a rare family name. The last name Umai is habitual in Malaysia, where it is quite a rare surname, Japan, where it is a rare surname, and Georgia. Measured by absolute frequency, the name is most common in Japan, Malaysia, and Pakistan. Likewise, Umai is the forename as well as the last name.