Sleipnir

The third root of the ash extends to heaven, and beneath that root
is a well which is very holy, called Weird’s well. There the gods
have their court. Every day the Æsir ride there up over Bifrost. It is
also called As-bridge. The names of the Æsir’s horses are as
follows: best is Sleipnir, he is Odin’s, he has eight legs. Second is
Glad, third Gyllir, fourth Glær, fifth Skeidbrimir, sixth Silfrtopp,
seventh Sinir, eighth Gils, ninth Falhofnir, tenth Gulltopp, Lettifeti
eleventh. Baldr’s horse was burned with him.


- Prose Edda, Gylfaginning