2 votes for ki-rin, eh? Guess I will get to it (one of these days)...
I think there are oliphants in AD&D as well as hollyphants (oliphants may be somewhat disappointing to Tolkein fans, though, since most of them are only 8' at the shoulder (if I remember correctly), although it says that some can be much bigger...) Lots of pachyderms in AD&D
Hmm - some FR Avatars even overlap with some of the pantheons you listed there!
Tyr - Forgotten Realms, Norse
Sharess/Bast - Forgotten Realms, Egypt
Vergadain/Bes - Forgotten Realms (Dwarf), Egypt
2 for 1, eh? (No FR + Greco-Roman, though, at least as far as I can remember...)