←
Old English būc (inherited)
←
Middle English bouk (inherited)
←
Proto-Germanic *būkaz (inherited)
←
Proto-Indo-European *bʰōw- (derived)
←
Icelandic búkur (cognate)
←
Norwegian Bokmål buk (cognate)
→
Luxembourgish Bauch (mention)
→
Albanian bukur (cognate)
→
Saterland Frisian Buuk (link)