Achillefs is a modern Greek form of Achilleus, which is the classical Greek version of the legendary name Achilles. The name is rooted in ancient mythology, with its ultimate origin tracing back to the Homeric hero Achilles, whose name in Greek (Ἀχιλλεύς) is of uncertain etymology. It has been suggested that the name derives from the Greek word ἄχος (achos) meaning "pain" or from the Achelous River, but no definitive explanation exists.Achilles was the greatest warrior of the Greek army in the Trojan War, as immortalized in Homer's Iliad. He was the son of the mortal Peleus and the nymph Thetis, who attempted to make him invulnerable by dipping him in the River Styx—but his heel, where she held him, remained untouched. This flaw led to his death when an arrow struck his heel, giving rise to the term "Achilles' heel" for a fatal weakness.After antiquity, the name was adopted by early Christians; Saints named Achilles or Achilleus include a Roman soldier martyred with Nereus in the 1st century. In modern times, Achillefs remains in use in Greece alongside the variant Achilleas. Related forms in other languages include Italian Achille and Spanish Aquiles, all ultimately stemming from the same mythological source.EtymologyStandard etymology links Achillefs to Greek ἄχος ( "distress" or "pain"), perhaps referencing the hero's role as a bringer of pain to his enemies or his own tragic fate. Another theory connects it to the name of the Achelous River, a major waterway in Greece that was often personified as a river god in mythology.Achilefs represents the direct modern Greek ecclesiastical and vernacular continuation of the name, following regular sound changes from Ancient Greek. It is typically pronounced with the stress on the second syllable: ah-KHEEL-efs.Meaning: Possibly "pain" or derived from the Achelous River (uncertain)Origin: Modern Greek form of Achilleus, from Ancient Greek ἈχιλλεύςType: First nameUsage: GreeceRelated Names: Achilleas (modern Greek variant), Achilles (mythology), Achilleus (ancient Greek), Achille (Italian), Aquiles (Spanish)