Hi Rebecca! Welcome to the forum.
Oh geez.....if that popped up on my CR, I'd be freaking out, thinking identity theft. But admittedly, I'm an alarmist.
My first thought would be to pull ALL your CR's from all 3 CRA's, and compare the 3 to see if it's on all of them. Secondly, I'd dispute with the CRA's that the account isn't mine.
But do not act on what I say. It's never happened to me(knock on wood).
Suggest you do nothing until you've formed a course of action based on the input of others, here. I'm sure they will chime in shortly.
Good luck to you.