cnuachd

head, brow, temple, Irish cruaic (O'R.); cf. Welsh cnuwch, bushy head of hair, cnwch, knuckle, cnuch, joint, *cnoucco-, "a prominence"; root kneu, knu; Norse hnúkr, hnjúkr, knoll, peak, hnuðr, a knob. Hence cnuachdach, shrewd: "having a head".