German öffnen

← English open (cognate)

← Proto-Germanic *upanōną (inherited)

← Middle High German offenen (inherited)

← Old High German offanōn (inherited)

← Dutch openen (cognate)

→ English open (cognate)

→ Old English openian (cognate)

→ Danish åbne (cognate)

→ German eröffnen (prefix)

→ German Öffner (affix)

→ Pennsylvania German effne (cognate)