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In all the world, Костелло (Costello , Costelloe , Костелло ) is a rare primarily male, but very infrequently female first name. The forename Костелло is habitual in Ireland, where it is a rare boy's name, the United States, where it is a very rare mostly masculine, but infrequently girly name, and China, where it is an extremely rare boy's name. Much more prevalently, Костелло is the last name as well as the forename.
Костелло is also a name for the fictitious and mythical characters: .