Old Norse þriði

← Proto-Germanic *þridjô (inherited)

→ Danish tredje (derived)

→ Faroese triði (derived)

→ Westrobothnian tridi (inherited)

→ Old Swedish þriþi (inherited)

→ Icelandic þriðji (inherited)

→ Norwegian Bokmål tredje (derived)

→ Norwegian Nynorsk tredje (derived)

→ Swedish tredje (inherited)