who (pron.) Look up who at Dictionary.com
Old English hwa "who," sometimes "what; anyone, someone; each; whosoever," from Proto-Germanic *hwas (cognates: Old Saxon hwe, Danish hvo, Swedish vem, Old Frisian hwa, Dutch wie, Old High German hwer, German wer, Gothic hvo (fem.) "who"), from PIE *kwo-, stem of relative and interrogative pronouns (cognates: Sanskrit kah "who, which;" Avestan ko, Hittite kuish "who;" Latin quis/quid "in what respect, to what extent; how, why," qua "where, which way," qui/quae/quod "who, which;" Lithuanian kas "who;" Old Church Slavonic kuto, Russian kto "who;" Old Irish ce, Welsh pwy "who").