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Last name Bub (Bub , バブ , Boop ) , in the world, is quite a common surname. The surname Bub is characteristic of Germany, where it is quite a rare surname, Bahrain, and Libya, where it is a rare surname. Measured by absolute frequency, this name is the most popular in India, Germany, and the United States. Much less frequently, Bub is the forename as well as the last name.