While I'm on the subject of marriage, while husband is usually a reflex of *hi(N)kraN, 'to marry (of a man)' is usually *kraN-ka, cf. Winnebago kaNkaNk, Ioway-Otoe graNge, Omaha-Ponca egdhaNge 'husband' and Teton hignaka (apparently also 'husband'). So these forms offer a fairly widespread example of X :: X-ka.