Where does “riem” come from?

riem (Dutch) comes from Middle Dutch rieme, from Old Dutch riomo, from Proto-West Germanic reumō, from Proto-Germanic reumô, from Proto-Indo-European rew- — to roar, growl, grumble; to roar; growl; grumble;...

riem (Dutch): belt, strap, thong, collar; seat belt; oar,...