From Jurchen, presumably cognate with Evenki лукучнӯн (lukuçnūn, “sword”, North Baikal), also found in other Tungusic languages of the south, but these may be Manchu loans.
Compare Udihe ло̄ (lō), Negidal лохон (loxon).
ᠯᠣᡥᠣ (loho)