My friend did the same thing when I told her about the feelings I felt about my ex when we broke up… I doubt he cares. (My name is also easily googe-able too, so…)
I hardly think this would ever be the case. It’s why I decided to go with strange anime/weaboo names. My tip for you is to usually do the first initial and last. For example M. Hartmann
I wouldn’t pay any mind to it. Keep up your NC and if she does mention that you entered a relationship during this time, all you have to do is to be honest. Don’t sugar coat it.