Corbin,
LXA is also traditionally know as the Lamb Chops, Lamb Chop Shop, etc.... I'm not sure where the name comes from (I'm sure it's a joke regarding the word lamb, but I won't go there...)
Also, LXA's first meaning was "Loyal Collegiate Associates" which has been nicknamed Loyal College Asses, Little College Asses, etc...., of course, the true meaning of LXA, I won't go into...
ZAX
Other's I've heard/seen posted: (I didn't make them up, so don't blame me...)
SAE - Somebody, Anybody, Everybody, or Same A$$****s Everywhere
AlphaPhi - All for Free
Chi Omega - Chi O, or, Chi Ho
Kappa Alpha Theta - Date-a-Theta
Tri Delts - Try a Delta
There are many many more out there...feel free to share yours...