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Surname Lagna (Lagna ) , throughout the world, is quite a rare last name. The family name Lagna is characteristic of Italy, where it is quite a rare surname, the Democratic Republic of the Congo, where it is a rare surname, and Argentina. Not in comparison with a country's population, it is the most numerous in Italy, the Democratic Republic of the Congo, and Philippines. Also, Lagna is the forename as well as the last name.