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Cognomen Grilo (Grilo , Gryllus , Γρύλλος) , all over the world, is a common family name. The family name Grilo is characteristic of Portugal, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Angola. Not in comparison with a country's population, it is the most numerous in Portugal, Brazil, and Angola. Much less frequently, Grilo is the forename as well as the last name.