That's interesting. Google Translate says that ffridd means frith, so that's no help. The University of Wales Trinity Saint David gives the following:


ffridd        1. mountain pasture n.f. (ffriddoedd) sheep walk n.f. (ffriddoedd) intake (=reclaimed moorland) n. (ffriddoedd)

If it's the same word as the Anglo-Saxon, it has lost the woods somewhere. Do you suppose n.f. means 'noun from'?