Kudos on a great topic fellow Pirate.
Been using the same gamertag for as long as i can remember, in fact i haven't used another on a main account i have for any game.
The story is as follows.
Most irl call me Trick but alas the username Trick is vastly used up so naturally one has to select another.
Numbers on the end didn't cut it for me nor did an alternate spelling at the time.
I had decided, since back then i was playing games primarily (for the most part) as a solo player outside of groups clans ect and felt i'd like something to reflect this along with a nod to my irl nickname but with a twist on it.
Thus the "olos" part was born in homage to my long stint of solo game play and just the irl twist was needed.
This was half born from a tease nickname my dear friends (still to this day, darn blighters that they are) call me "Trixxabelle" this to my sort of shame was due to having hecked up legs as a child and teen that caused me to forever walk on my tiptoes ergo the ballerina esque twist to my nickname.
I decided the "Ixx" would be a nice nod to my fellow friends long term tease, which i love them for btw :P
And there we have it, how my gamertag "Ixxolos" came to be.
Funny Fact:
Strangely people have some funny and often at time confusing ways of attempting to say it back to me in game and i simply adore to see it butchered by a streamers and gamers alike. :D
Fair Winds to all, Some really good GT origin stories here.