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Throughout the world, Riah (Riah ) is quite a rare dominantly feminine, but uncommonly male forename. The first name Riah is habitual in Namibia, where it is quite a rare feminine name, Indonesia, where it is a rare dominantly feminine, but seldom masculine name, and United Arab Emirates, where it is a rare feminine name. Measured by absolute frequency, the name is most common in Indonesia, Philippines, and South Korea. Likewise, Riah is the last name as well as the forename.