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Cognomen Leonydas (Leonydas ) , in all the world, is an extremely rare family name. Much more frequently, Leonydas is the forename as well as the last name.
Leônydas, and Леонидас
Guy, Valentim, Pimentel, Portugal, Mendonca, Oconnor, Vitorio, Candido, Andrade, Santana, Martins, Oliveira, Loiola, Chaves, Araujo, Santos, Ramos, Costa, Assis, Souza, Sousa, Silva, Knob, Bastos, and Raudonius