for, for the sake of (because of) · on behalf of (speaking or acting for)
köken: Disputed; there are two Old Irish nouns son, one meaning ‘sound; word, name’ (a borrowing from Latin sonus), and one meaning ‘prosperity, well-being’ (cognate with sonae (“happy”) and sonus (“good fortune”)). The connection with sonus was rejected by the Lexique étymologique de l'irlandais ancien, its authors unconvinced on semantic grounds. The Dictionary of the Irish Language associates the…