I disagree, 0ad is very searchable. You pretty much cannot miss it in a google search unless you heard about it via word of mouth (zero ay dee, maybe). Using just three characters means the game is very easy to search and remember. While a full set of words might at first seem easy to remember, "Ancient Empires", "Empires at war", and even "Empires Ascendant" come across as fairly generic and thus not memorable.
unfortunately this topic comes up very often in google searches of "0ad", maybe we should consider renaming it, since the discussion proves 0ad will not in fact die, at least not in the foreseeable future.
If the name was "Ancient Empires", we would be in conflict with not only real history information, but also a history channel television series, books, and another videogame.