A few from my previous stomping grounds, Northeastern Oklahoma/Northwest
Arkansas.

KRMG (AM 740) - Originally owned by Kerr McGee oil company
KVOO (now KFAQ 1170AM) - stood for Voice Of Oklahoma - I believe these
calls are now parked on the sister FM at 98.5.
KMOD - acronym for Middle Of the Dial (97.5FM)
KELI (used to be AM1430) - if memory serves, Kelly was the name of the
original owners' daughter.
KXOJ (100.9 FM) - Christian easy listening station - ironically, the calls
stood for eXcited Over Jesus.
KCFO (AM 970) - Christian talk station, the calls stand for Christ For
Oklahoma - originally these calls were parked at 98.5FM as "Love 98".

KXUA (88.3 FM) - University of Arkansas
KUAF (91.3 FM) - University of Arkansas at Fayetteville

KAMO (94.3 FM) - The story I was told was that when the station signed on in
the late 60's, it was the only FM in the region that could be heard in all
four of the following states - Kansas, Arkansas, Missouri and Oklahoma.

KBVA (106.5 FM) - Licensed to Bella Vista, Arkansas.

KURM (AM 790) - I've actually met the original owner, and his first name
was/is Kermit.