Where does “deyrsnys” come from?

deyrsnys (Manx) comes from Middle Irish doírsine, from Old Irish daíre, from Old Irish dáir, from Old Irish daur, from Proto-Celtic daru, from Proto-Indo-European dóru, from Proto-Indo-European drew- — hard, firm, strong, solid; hard, fast; tree.

deyrsnys (Manx): slavery; serfdom; bondage