Proto-Germanic *birkijǭ

→ English bark (mention)

→ English birch (inherited)

→ Faroese bjørk (derived)

→ Westrobothnian bjerk (inherited)

→ Icelandic björk (derived)

→ Luxembourgish Bierk (derived)

→ Norwegian Bokmål bjørk (derived)

→ Norwegian Bokmål bjerk (inherited)

→ Norwegian Nynorsk bjørk (derived)

→ Norwegian Nynorsk bjørkje (inherited)

→ Old Norse birkja (inherited)

→ Swedish björk (derived)