←
Proto-Germanic *kulą (inherited)
←
Middle High German kole (inherited)
←
Middle High German kol (mention)
←
Middle Low German kōle (derived)
←
Old High German kol (inherited)
←
Proto-Indo-European *ǵwelH- (derived)
→
Cimbrian kholl (cognate)
→
Pennsylvania German Kohl (cognate)