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Family name Σκληρός (Σκληρός, Sclera , Skliros ) , in all the world, is a rare surname. The cognomen Σκληρός is characteristic of Greece, where it is quite a rare surname, Australia, where it is a rare surname, and South Africa, where it is a very rare surname. Measured by absolute frequency, it is commonest in Greece, Australia, and the United States.