←
Proto-Germanic *bōks (inherited)
←
Proto-Germanic *bōkō (inherited)
←
Old Swedish bok (inherited)
←
Old Swedish bok (inherited)
←
Proto-Indo-European *bʰeh₂g- (derived)
←
Old Norse bók (inherited)
←
Old Norse bók (inherited)
→
Old English boc (cognate)
→
German Low German Book (cognate)
→
Elfdalian buok (cognate)