GuyGirl who uses an incredibly common computer science term as a pseudonym, starting on EFnet a quarter century ago and then decides whether or not to use your service based on whether that name is already taken.
guygirl who uses an old trademark as a pseudonym, starting ~a decade ago, and then is overjoyed when she doesn't have to append some extra numbers on the end on a new service
person whose pseudonym is a seemingly unique string that is an in-joke with exactly one other person derived from insomniacally attempting and failing to recall a passage from the Hitopadesha1 whose on-the-fly translation for Sanskrit homework they had comedically mangled some time prior as "dog say: repetition of my business how by you doable", producing in the end a new string that, while technically grammatically possible, probably does not exist anywhere in the corpus (and would mean something different), making it surprisingly convenient as a username
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Didactic animal stories in the same intellectual genealogy as Aesop's Fables
heh. "Dog say."