←
Old English rō (inherited)
←
Old English rōw (mention)
←
Middle English roo (inherited)
←
Middle English ro (mention)
←
Proto-Germanic *rōwō (inherited)
←
Proto-Indo-European *ere(w)- (inherited)
←
Proto-Indo-European *rē(w)- (mention)
→
Alemannic German Ruew (cognate)
→
Luxembourgish Rou (cognate)
→
Norwegian Nynorsk ro (cognate)