from The Century Dictionary and Cyclopedia
- n. A Welsh weight of wool, about two pounds.
Sorry, no etymologies found.
Or perhaps “arlwydd pwys” means “the legitimate lord,” in opposition to usurpers, just as a wedded wife is styled “gwraig bwys,” as distinguished from a concubine.
Rhuawn Bevr, ab Gwyddnaw Garanhir; sev yu gelwid felly achaws rhoddi eu pwys yn aur am danynt o ddwylaw au lladdes.”