Dutch knol

← Old English cnotta (cognate)

← Proto-Germanic *knudan- (derived)

← Proto-Germanic *knudla- (mention)

← Proto-Germanic *knulla- (mention)

← Middle High German knolle (derived)

← Old High German *chnollo (derived)

→ English knoll (mention)

→ German Knolle (cognate)

→ Luxembourgish Knoll (cognate)

→ Dutch knolraap (compound)