okay sweetie, cause I'm a big ole dork, I looked at aries list and since I like Alpha and Xi, I came up with some other ones (that weren't on your list or the list aries gave the link too).
I also noticed from that list that Eta and Mu are the least used letters as a first letter (if that makes sense).
Here is the list I came up with (like I said I'm a dork. LOL).
Alpha Xi Pi (one of my personal faves. like the way it looks in greek letters)
Alpha Xi Theta (another fave
)
Alpha Xi Chi
Alpha Xi Phi
Alpha Xi Kappa
Alpha Xi Omicron
Alpha Xi Epsilon
Alpha Xi Beta
Alpha Xi Mu
Alpha Xi Nu
Eta Xi Alpha
Eta Gamma Beta
Eta Sigma
Eta Omega
(Love the way all of these look in the Greek letters):
Mu Xi
Mu Theta
Mu Delta
Good Luck sweetie!!!!!!