Jörg Knappen wrote on Sun, Jan 8, 2012 11:26 AM UTC:
I am aware of the name Okapi for about a decade when I found it in several problem databases on fairy chess problems. However, a search here
http://www.softdecc.com/pdb/search.pdb
(enter PIECE='Okapi' in the query form)
reveals some problems going back to 1970, Most Okapi problems are authored by Erich Bartels, but other prblemists joined the crew. If you have ever seen an okapi (I did, the Franfurt/Main zoo is a proud owner of the rare species), it is a particulary well choosen name for a horse-zebra vompound.
Digging through references on Gazelle, I found it only as a synonym for Camel (the (1,3).-leaper) in Turkish great chess V
http://www.chessvariants.com/large.dir/greatchessv.html
This is confirmed by George Duke here:
http://www.chessvariants.com/large.dir/falconpatent.html
and George know more chess variant literature than I can ever dream of.
The Ferz-Knight compound has the synonym priest - again a very unspecific name. It occurs in Töws' Generic chess piece creation system and Derzhanski's list.
I once aggressively tracked names for compound leapers and noted them on paper, it looks like a good idea to put them on the CVP pages some time.