Old Norse þurfa

← Proto-Germanic *þurbaną (inherited)

← Proto-Indo-European *terp- (root)

→ Old English þurfan (cognate)

→ Danish turde (mention)

→ Old Swedish þorva (inherited)

→ Icelandic þurfa (inherited)

→ Norwegian Nynorsk turva (inherited)

→ Norwegian Nynorsk turvast (mention)

→ Old Norse þurfsamr (suffix)

→ Old Norse þarfa (mention)

→ Old Norse þarfr (mention)