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All over the world, Cássio (Cassio , Cássio , كاسيو ) is a common boy's given name. The given name Cássio is characteristic of Brazil, where it is quite a common male name, Portugal, where it is a rare masculine name, and Albania. Not in comparison with a country's population, it is the most numerous in Brazil, Italy, and Angola. Very seldom, Cássio is the last name as well as the forename.
Cássio is also a name for the fictitious and mythical characters: Cassio Tagge , character in Star Wars: Episode IV – A New Hope and Cassio , the operatic character in the opera Otello by Giuseppe Verdi; Otello's captain.