First, "Esposo" means "husband" in Spanish. "Edda" refers to the Eddas, which are sources of Old Norse mythology. So the husband of Edda, probably Odin, since he's a main figure. But wait, Odin's associated with the Eddas through his quest for knowledge. He gave up an eye to drink from the Well of Mimir, but is there a more direct connection? The user specified 2 letters, so the answer must be a two-letter name in Spanish that fits.