Wheeler comes from wheel + -er, from Old English hwēol ('wheel'), from Proto-Germanic *hwehwlą, from Proto-Indo-European *kʷékʷlos ('wheel, circle'). In current use it is a noun meaning "a horse harnessed nearest the wheels, or something with a stated number of wheels". That sense is explained by the older material without requiring a speculative semantic step: the inherited or borrowed base supplies the field of meaning, while the English formation fixes its modern role. The surface form is compositional: its joined elements remain visible in the modern word. The historical chain includes Old English hwēol and Proto-Indo-European *kʷékʷlos. Related English forms include wheel and wheeled. The word's history is thus visible in its construction: the components remain interpretable even after the whole expression has settled into a conventional English meaning.