I see so many users with usernames, and wonder how they came about. When I signed up, there was no visible secondary option to select a username, so I ended up with my actual name with an 89 attached to the end. Why on earth there's an 89 at the end is beyond me, especially since I'm the only member named Ken Gervais.
Had there been an option, I certainly never would have chosen my name as a username, especially since I despise usernames with hyphens, dots or any kind of connector between names. I keep hoping that an option to add or change username will appear within the settings, but no luck so far. Still, I will keep looking and maybe one day, I'll be able to have ad use a name that's related to my avatar.
In the meantime, I'll keep checking...