When my wife and I had our phone sex company years ago, any content we bought, be it from Ounique, Amazing Content (always great material from Stefan
), Matrix who any of the other content companies that have gone belly-up, we always made up fictional names for the models once we put them up on the sites.
I always thought it was hilarious when other phone sex sites claimed they used real pictures of their girls (to the consumer), and then used pics of established porn stars and kept the same name.
Regardless, unless you're trying to bank on an already established name, I would make up your own.