I've made a practice of naming pieces within "alien menagerie" in Japanese as well as English, (using the Japanese title within each image).
The Japanese name I gave the overall project is "uchujin doumei" (宇宙人同盟)which translates to "The League of Outer Space Men" or maybe "The League of Aliens". I really like how this title translates to English too, in some respects better than "Alien Menagerie", but I also enjoy that the names I'm using aren't direct equivalents.
Having two titles in this way allow me to express a slightly different interpretation of the project, even if it's obscure.