There has been a suislide drift association (along with an group of sponsored competitive drivers; marc rozzo, wade odrey, mike schneider, and rj nunley) headed by Wade Odrey throughout Western Pennsylvania and New Jersey and New York since like 2005 or even earlier. There are YouTube videos, and even a website along with merchandise (I have a sweatshirt) that are made by the real life association. The GT5 team that silvia_s13_lover and I were involved with was originally led by Silvia on Midnight Club LA and inspired by this real life team, and we even had a member who was on the real team (Marc Rozzo. If I remember correctly, he gave permission to use the name). you literally cannot go to a drift event in the east coast/midwest without seeing Suislide stickers on at least a few cars. Look up some videos on YouTube of the drivers listed above.
Since it was Silvia's team, it's really up to him whether there is a problem with you guys using the same name. Just know that if you do, you will probably be affiliating yourself with myself, Silvia, zedfonsie, mycatgoesmeow (now known as crispwheels) and some others, and a good bit of the community will probably think that you're associated with us. It would probably be most convenient for everyone, especially for yourself, if you decided on a new name.
In other words, Good luck with the competition! I'd join if I wasn't on the wheel starting out.