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Last name Seguro (Seguro , Sigur , Siguro ) , throughout the world, is quite a common surname. The cognomen Seguro is habitual in Belize, where it is quite a common surname, Portugal, where it is quite a rare surname, and Croatia. Not in comparison with a country's population, it is commonest in Colombia, Brazil, and Portugal. Much less frequently, Seguro is the forename as well as the last name.