Achilles

From the Greek Ἀχιλλεύς (Achilleus), which is of unknown meaning, perhaps derived from Greek ἄχος (achos) meaning “pain” or else from the name of the Achelous River. This was the name of a warrior in Greek legend, one of the central characters in Homer’s Iliad. The bravest of the Greek heroes in the war against the Trojans, he was eventually killed by an arrow to his heel, the only vulnerable part of his body.This name was sometimes used as a personal name, and was borne by a few early saints, including a Roman soldier martyred with Nereus in the 1st century.
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Achelous

From Greek Ἀχελώιος (Acheloios), which is of unknown meaning, possibly of Semitic origin. This was the name of a Greek god of water and rivers, in particular the Achelous River in western Greece. He fought with (and was defeated by) Herakles for the hand of Deianeira.
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