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Surname Gryllus (Grill , Grilo , Grelo ) , around the globe, is a common family name. The surname Gryllus is characteristic of Portugal, where it is quite a common surname, Austria, and Luxembourg, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Portugal, Brazil, and Germany. Very seldom, Gryllus is the forename as well as the last name.