Jackson Crawford made a video about it that pretty much sums up the conclusions I came to when reading the myths: https://www.youtube.com/watch?v=5eN3wNgPARMYouTubeYouTube tl;dr Freya has a huge amount of aspects that you'd expect out of Odin's wife, such as choosing the seating in Valhalla, and being the Queen of the Valkyries. Heck, her husband's name is even Od (madness), which is the base word for Odin (mad one). Freya has a title but no name, but has a family and a backstory. Frigg has no backstory or family, has a name, but no title. There's a huge amount of overlap between them, to the point where in the myths they're almost completely interchangeable, except for the one or two stories where they suddenly appear together, that's why they're listed separately, and because he follows the myths to the letter, he has to consider them different in scholarly circles. However, in other videos, he makes it very clear that in his own personal opinion, outside of scholarly circles, they're the same. Arith Harger also made a video on the topic, but he looks at the mythology from the archaeological perspective: https://www.youtube.com/watch?v=9S6ALPEmOhgYouTubeYouTube tl;dr: From the archaeological perspective they are the same. The split came when Christianity showed up, and they needed to find parallels between the religions in order convert people. Odin obviously became their analog for (((God))), but Odin was too dark for their liking, so they managed to change the focus of Odin from the War, Death, and Madness aspects of him, to the Wisdom, Poetry, and King of the gods aspects of him. But, they still needed a Virgin Mary analog, and the obvious choice was Odin's wife. But, you can't have your Virgin Mary analog being what they considered a "Slutty Witch", so they pushed the aspects they deemed "negative" off onto Freya, and kept the "positive" ones on Frigg. The few stories where they're both showing up, just so happen to be the ones that have been tampered with the most by Christians. To me, I consider them as different stages in the same Goddess' life. She starts out as "Freya", and change comes in the story where she gets Brísingamen, and the followup stories. She sleeps with the dwarves for the necklace, Odin finds out, curses her to wear the necklace forever, and then runs out of the hall to wander the world in grief. She realizes the pain that her cheating has caused to the people around her, and declares that from that point forward, she will be the most devoted and loyal wife ever, will never leave her husband's side, and runs off to follow him. When she finally finds him, his grief has turned him into a mindless sea monster, but following her oath, she stays by his side anyway, until a hero shows up and kills him. Freya, in her grief goes to Hel, to beg Hel to give her husband back, and Hel gives her the impossible task of making two very powerful kings fight forever, or until a Christian man shows up to save them. Freya does this, and Hel judges Odin's death to be one in battle, and he pops up in Valhalla like nothing happened. This is the point where I consider her to have fully changed over to "Frigg", the quintessential wife and mother. But, do to the nature of gods, she can be two separate goddesses, and the same goddess at the same time. Like when Odin split himself into High, Just as High, and Most High. They were all different gods, but at the same time, the same god. If Odin can split himself into different aspects, then Frigg/Freya can do the same. Same Goddess, just different aspects.