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Family name Eo (Io , Eo , イオ ) , throughout the world, is a common cognomen. The cognomen Eo is characteristic of Macao, where it is a common surname, Albania, where it is quite a rare surname, and Hong Kong. Not in comparison with a country's population, it is the most numerous in Indonesia, Myanmar, and China. Also, Eo is the forename as well as the last name.