Etymology
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Achilles 
Greek hero of the Trojan War stories, bravest, swiftest, and handsomest of Agamemnon's army before Troy, he was son of Thetis and Peleus. His name is perhaps a compound of akhos "pain, grief" (see awe) + laos "the people, a people" (see lay (adj.)); or else it is from Pre-Greek (non-IE). Related: Achillean.
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Thetis 
name of a sea goddess in Greek mythology, mother of Achilles by Peleus. Since Roman times, sometimes, in poetry, "the sea personified."
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