Old Norse því

← Old English þȳ (cognate)

← Old English þæt (mention)

← English the (link)

← Proto-Germanic *hwī (derived)

← Proto-Germanic *sa (mention)

→ Old English þy (cognate)

→ Danish fordi (mention)

→ Danish thi (inherited)

→ Westrobothnian dy (inherited)

→ Icelandic því (inherited)

→ Norwegian Bokmål fordi (mention)

→ Norwegian Bokmål thi (inherited)

→ Norwegian Nynorsk di (inherited)

→ Norwegian Nynorsk fordi (mention)

→ Swedish ty (inherited)

→ Swedish förty (mention)