West Frisian iepen

← Proto-Germanic *upanaz (inherited)

← Old Frisian open (inherited)

← Old Frisian opin (mention)

← Old Frisian epen (mention)

→ English open (cognate)

→ Old English open (cognate)

→ Westrobothnian yppe (cognate)

→ Icelandic opinn (mention)

→ Norwegian Bokmål åpen (cognate)

→ Norwegian Nynorsk open (cognate)

→ Swedish öppen (mention)