Proto-Norse ᚢᚦᛡᚱᛡᛒᛡ

← Proto-Germanic *un- (inherited)

← Proto-Germanic *þarbō (inherited)

← Proto-Norse ᚢᚾ- (compound)

← Proto-Norse *ᚦᚨᚱᛒᚢ (compound)

← Proto-Norse ᛒᛡᚱᛁᚢᛏᛁᚦ (mention)

← Proto-Norse ᚺᚨᚱᚨᛒᚨᚾᚨᛉ (mention)

← Old Norse úþǫrf (link)

← Old Norse óþarfa (link)

→ Proto-Norse ᚺᚨᚱᚨᛒᚨᚾᚨᛉ (mention)

→ Proto-Norse ᛒᛡᚱᛁᚢᛏᛁᚦ (mention)

→ Proto-Norse ᛒᛡᚱᚢᛏᛉ (mention)

→ Proto-Norse ᛡᚱᛡᚷᛖᚢ (mention)