Whose

Chamber's Etymological of the English Language · 1895 · p. 571

hC57, pron. the po e ive case of Who or Which.— Whosesoev er (£.) of whomsoever. (M. E. hwas—A S. hwees. WhOBO, hOD'so, WhOBOever, hOC-so-ev'er, indefi iiite relative pron. every one who whoever