Nobody in Thailand goes by their legal name day to day. Everyone has a short nickname given in childhood, and women who work in Pattaya bars use theirs at work, with friends and with family. Nok, Pond, Bee, Fern, Ploy: those are not stage names. They are what she is called.
If you write "Dear Supaporn", she will know you looked at her passport and nothing else. If you write "Nok", she knows you were there. The nickname is the name that carries the memory, and it is also the name her bar knows, so it is the one that finds her.
Every woman here has a page under her nickname. Search her name on the front page and you get every woman with that nickname, with her cartoon and the bar area she works in, so two Noks are easy to tell apart. If she gave you a card with a code on it, the code opens her page directly.
Thai nicknames get written into English several ways. Nok and Nock, Bee and Bea, Fon and Phon. Try the shorter spelling first. If you remember the bar area or the week you were there, that narrows it too.
Not every woman has joined. If you cannot find her, the honest answer is that she is not on here, and any page claiming otherwise would be a fake. The women on this site are real people who chose to be here, which is the whole reason a message to one of them gets a reply.