Unfortunately anons love playing internet detective (someone has [common name] and plays [extremely popular character from a canon that was big a few years ago], they must be the exact same person!), so someone probably "pieced it together" and will never let it go. It might be worth it to make something linkable with proof that you exist and a statement of I'M NOT THAT SETH, but I'm not sure where would be the right place to put that, either.