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In the world, 木木 (Mumu , 木木 ) is quite a common unisex first name. The given name 木木 is characteristic of Indonesia, where it is quite a rare gender-neutral name, Haiti, where it is a rare female name, and Bangladesh. Measured by absolute frequency, it most frequently occurs in Indonesia, Bangladesh, and China. Also, 木木 is the last name as well as the forename.
木木 is also a name for the fictitious and mythical characters: Mumu , the fictional dog from Turgenev's Mumu.