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Throughout the world, Biddy (Biddy , בידי ) is a rare principally girly, but scarcely masculine first name. The forename Biddy is habitual in Ireland, where it is quite a rare girly name, Hong Kong, where it is a rare female name, and Australia. Not in comparison with a country's population, it is commonest in the United States, Ireland, and the United Kingdom. Likewise, Biddy is the last name as well as the forename.
Biddy is also a name for the fictitious and mythical characters: Biddy Flynn , the musical character in the musical Eileen by Victor Herbert.