The name Friday comes from the Old English Frīġedæġ, meaning the “day of Frige”, a result of an old convention associating the Old English goddess Frigg with the Roman goddess Venus, with whom the day is associated in many different cultures. The same holds for Frīatag in Old High German, Freitag in Modern German and vrijdag in Dutch.
The expected cognate name in Old Norse would be *friggjar-dagr. However, the name of Friday in Old Norse is frjá-dagr instead, indicating a loan of the weekday names from Low German. The modern Scandinavian form is Fredag in Swedish, Norwegian and Danish, meaning Freya’s day. The distinction between Freya and Frigg in some Germanic mythologies is problematic.
Friday is associated in many cultures with the love goddess Venus, and the planet named for her.