An unglossed root in The Etymologies of the 1930s with the derivatives ᴹQ. lango “broad sword; prow of a ship” and N. lhang “cutlass, sword” (Ety/LAG), so probably meaning something like “*cut”.
Reference ✧ Ety/LAG
Derivatives
> ᴹQ. lango¹ “broad sword; prow of a ship” ✧ Ety/LAG