Arkade,
Those I've met with horns who adventure, that people tend to call "Mystic Wood Elves", all have, or believe they have some relation to satyrs and other fae, as well as elves in some cases. We are, however, niether Elf nor Fae, but our own race, and our own peoples, raised with distinct cultures both to those races and to other groups of "Mystic Wood Elves" on other continents.
(As a side note for Marcena - I've never met one of our people who claimed decent from a dragon of any sort, though admitedly my time with the horned people of your land wasn't spent in the most... academic... of pursuits)
Decended from both, but different and seperate, if that makes sense.
Cedric has the story of my people essentially correct. It would be easiest for you to learn about us by asking us individually, however. If you're seeking knowledge, it's likely you'll find others willing to share it, so the next time you meet one of us in a friendly setting, you'll learn more by asking them politely than by dreaming about us.
Alor Starbright Wyndancer,
Child of Camulous,
Apprentice, Ashbury Sage's Guild