I was in one of the local Asian markets and I ran into a provider I know who was with her boyfriend that I had never met. She came right up to me and said hello, fortunately I knew both her real and her hooker name, but I didn't address by either until I got her aside and asked her how much about her "life" her BF knew. Until then I never addressed her by name, either name. lol
Fortunately she had told him everything and there were no more awkward moments, and she knew quite well that I wouldn't be embarrassed as she knew everything about me as well, since I had dated one of her GF for several months.
My last bit of advice on the matter is that if this does happen to you, and you don't know beforehand what name to call her, it's best not to call her by any name at all, a simple "Hi stranger" can't get you, or her into any trouble.
OK, I've read some other boards and know that some clients have great friendships with providers. However, there is one provider I know of that probably lives in same town/section of town I do, and I just may run into her when I'm out and about... Do I assume the name I know her by is her's... Would hate for her to say hello especially if I'm with wifey. (LOL)... then again maybe she's with hubby (OH NO!!!).. I hope most providers ARE discreet..