Old Norse þǫrf

← Proto-Germanic *þarbō (inherited)

← Proto-Indo-European *terp- (root)

→ Danish tarv (inherited)

→ Faroese tarvur (derived)

→ Faroese tørvur (derived)

→ Icelandic þörf (inherited)

→ Norwegian Bokmål tarv (inherited)

→ Norwegian Nynorsk tarv (derived)

→ Norwegian Nynorsk torv (inherited)

→ Old Norse þarfa (mention)

→ Old Norse þarfagangr (compound)

→ Old Norse þarfna (mention)

→ Old Norse þarfr (mention)

→ Old Norse þǫrfgi (suffix)

→ Swedish tarv (inherited)