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In all the world, Barnaby (Barnaby ) is quite a rare primarily masculine, but very seldom feminine first name. The given name Barnaby is characteristic of Puerto Rico, where it is quite a rare boy's name, the United Kingdom, and Australia, where it is a rare male name. In absolute terms, the name is most common in the United Kingdom, the United States, and Nigeria. Likewise, Barnaby is the last name as well as the forename.
Barnaby is also a name for the fictitious and mythical characters: Barnaby , the fictional character from Babes in Toyland and Barnaby Tucker , the musical character in the musical Hello, Dolly! by Jerry Herman.