On Steam my gamertag (Steam ID, whatever) is "Paulrus-Keaton?" which is a combination of two gamertags and nicknames i've been given. I couldn't decide which one O wanted to use from now on, so I just combined the two.
"Paulrus" was given to me due to my attention-whore behavior on my first day of 11th grade. I was into that Beatles song "I Am the Walrus" and exclaimed it loudly in all my classes. Eventually, my home class just put 'walrus' and 'Paul' together. Also, it turns out that Paulrus is one of those terms used by the "Paul Is Dead" people.
"Keaton" comes from my sprite comic years... and is the name of the yellow quizzing fox from Majora's Mask, who I thought kicked ass. My avatar was an anthropomorphic version of the creature in jeans, blue vest, white shirt, and wooden cross necklace. However, when my brothers became full-time furries... let's just say that's when the "keaton" phase ended. Also, i've feel i've grown out of using little exaggerated internet alter-egos anyway.
The question mark is just an artsy thing. I like to be a little absurd.