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Last name Baab (Baab , 巴布 ) , in all the world, is quite a rare cognomen. The cognomen Baab is characteristic of Germany, where it is a rare surname, the United States, and Saudi Arabia, where it is a very rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and China. More frequently, Baab is the forename as well as the last name.