Why?
 

Emerald Eyes came on my MAC mix this morning on bike ride this morning(love the song) and I was wondering why Bob Welch called it Emerald Eyes and not Mystery to Me? Does anybody know?

That's a mystery to me (too)

:)

Because 'Emerald Eyes' is repeated numerous times throughout the song and Mystery to Me isn't??? Because 'Emerald Eyes' is the entire focus of the song whom he's singing to/about???

There was already a song called Mystery to Me but it didn't make the album. This often happens, but I think personally that the "mystery to me" part is slight compared to the big first line of the chorus "Find Emerald Eyes in the night" part.

https://www.youtube.com/watch?v=peUibLfVRGw - here's that jam

Are you sure about that? You may be thinking of the fact that Welch's solo album His Fleetwood Mac Years & Beyond Vol 2 (which I recommend) featured a song called Mystery to Me. Bob's sleeve notes said there hadn't previously been a song by that title then added "There is now".