Alsvith

I found two characters with the name "Alsvith" ("the All Wise"):
1. a giant
2. a horse

1.
Alswith means "the All Wise", he was the giant, that wrote the runes for the race of the giants and all mankind.

Poetic Edda: Hovamol - The Ballad of the High One

2.
Alsvith, the horse = Alsvinn