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In all the world, Menggen (Menggen ) is an extremely rare unknown gender forename. Much less frequently, Menggen is the last name as well as the forename.
Менгген, 孟根, 孟艮, 梦哏, 梦根, 梦艮, 猛根, 萌根, and 蒙根
Xia, and Huang