The word "bichir" has Arabic origins (after the nomadic tribes of North Africa) and was pronounced "bee-sheer" by the French ichthyologist who first discovered and described Polypterus bichir. However, IME, most people in the U.S. pronounce it "biker" because we don't want to sound French. 
Edit: looks like Anne beat me to the punch.
Edit: looks like Anne beat me to the punch.

. but im sill sticking with bickar.