←
Proto-Germanic *feþrō (inherited)
←
Proto-West Germanic *feþru (inherited)
←
Proto-Indo-European *péth₂r̥ (inherited)
←
Proto-Indo-European *peth₂- (mention)
←
Plautdietsch Fadda (cognate)
←
Plautdietsch Fada (mention)
→
Norwegian Bokmål fjær (cognate)
→
Norwegian Bokmål fjør (cognate)
→
Norwegian Nynorsk fjør (cognate)