Frija-Frigg

Some scholars hypothesize that both Frigg and Freyja may have their origin in a Common Germanic goddess. There is no firm evidence for this, but scholars have found some similarities both in their mythological features and the possible etymologies of their names, as well as place-names associated with them. Due to linguistic variations between branches of Germanic languages, where even a god that is the same may be called by different-looking names, confusion about apparent cognates has not been conclusively resolved. Scholar Stephan Grundy comments that "the problem of whether Frigg or Freyja may have been a single goddess originally is a difficult one, made more so by the scantiness of pre-Viking Age references to Germanic goddesses, and the diverse quality of the sources. The best that can be done is to survey the arguments for and against their identity, and to see how well each can be supported."

The day of the week Friday in Old Norse is called both Freyjudagr and Frjádagr (for Freyja and Frigg respectively), in Faröese Fríggjadagur, and in Old High German was Frîatac, Frîgetac, and now Freitag, for Frigg. In Old English Frigedæg referred to Frigg as well.

The name of the early English goddess is attested only in the name of the weekday, although frīg (strong feminine) as a common noun meaning "love" (in the singular) or "affections, embraces" (in the plural) is attested in poetry.

Frigg is the most prominent female member of the Aesir faction of the Germanic gods, and often identified as the spouse of the chief god, *Wōdanaz (Woden, Odin). Freya is the most prominent female member of the Vanir faction of the gods, is described as being adept at seid (magic), and is the wife of Ód.

...
Wikipedia