Welsh rhedyn

← Breton raden (cognate)

← Proto-Brythonic *rrėdɨn (inherited)

← Proto-Celtic *ɸratis (inherited)

← Greek φτέρη (cognate)

← Proto-Indo-European *p(t)erH- (inherited)

← Cornish reden (cognate)

← Lithuanian papártis (cognate)

← Middle Irish raith (cognate)

← Old Irish raithnech (cognate)

→ Welsh rhedyna (affix)

→ Old Irish raithnech (cognate)