I believe that the name was chosen in accordance with British Air Ministry nomenclature in relation to the manufacturer's name and the aircraft's design mission (e.g. the name must begin with a certain letter - usually the initial letter of the manufacturer's name - and it must be the name of, say, a certain kind of animal. The number of syllables in the word is sometimes important too).
Klaatu83, e-mail, 17.08.2014 16:58
This contraption has to be the ugliest, and strangest, airplane ever built. In addition, it also must have had the oddest name ever bestowed upon an airplane as well. Whoever got the idea of naming an airplane an "Ape"?