People would have better usernames if they knew how to pick them properly.

People's names are a no-no. Popular is bad. Elendil might be a valuable name, but one may find that there's not much one can do, especially if you suck at LotRish. Random numbers and Xs are bad. Random letters are bad. Appending a number to the end of a name, no matter how "significant to you" it is, is bad.

Locations are good. Naming yourself after a tree/town is even better. Hell, the username "Liverpool" is freakin' phenomenal. But, not all locations are created equal. Philadelphia is superior to Dallas, Washington D.C, or New York City. See why? Alternatively, if you can't do that, just put together an adjective and a noun that don't go together. Adverb-adjective are also acceptable, but only if the two words' meanings are contradictory and/or exclusive. Proper capitalization is paramount to success!

Almost every username ever created sucks. But not mine. It fills all of the criteria as posted above.