Technically, we aren't supposed to know what ours is until we're dying, but being magicians I guess we find ourselves in liminal spaces often enough to maybe catch sight of it and survive.
To my understanding, tradition had it that everybody was accompanied by a Fylgja, which meant "a follower" and was related to the word referring to "placenta/afterbirth". This expresses, I think, a more accurate term for an animal spirit guide than either totem or familiar , both of which refer sort of to the tribe or family. The Fylgja would be very individual.
I also used to know the difference between the Fylgja, the Hamr, and the Hugr, and how they were expressed with having to do with spellcasting or the mental/emotional forces behind any intention.
So...those who have found it...What's yours?