Proto-Germanic *bōguz

→ English bough (inherited)

→ Old English bog (inherited)

→ Danish bov (inherited)

→ German Bug (inherited)

→ Middle Dutch bow (inherited(dum/en))

→ Middle Dutch boech (inherited)

→ Westrobothnian boy (inherited)

→ Luxembourgish Buch (inherited)

→ Luxembourgish Bou (inherited)

→ Dutch boeg (inherited)

→ Norwegian Nynorsk bog (inherited)

→ Old Norse bógr (inherited)

→ Swedish bog (inherited)