Old English þurfan

← Proto-Germanic *þurbaną (inherited)

← Old High German durfan (cognate)

← Gothic 𐌸𐌰𐌿𐍂𐌱𐌰𐌽 (cognate)

← Old Norse þurfa (cognate)

← Old Dutch thurvan (cognate)

← Old Frisian *thurva (cognate)

← Old Saxon thurƀan (cognate)

→ Middle English tharf (mention)

→ Middle English tharen (inherited)

→ Pennsylvania German daerfe (cognate)