Seriously freaked out

I had to spew this somewhere, and this seemed the most likely place to do so.

I am totally freaked out. After 7 years since my transition (as far as transition has an ending), i got introduced to a girl at work today. I introduced myself with my old name. The only reason I can think of is that her name sounds similar as my old one.

I'm really confused and freaked out about it. I've not done this a single time ever since i started my transition 10 years ago. Why now? And will it happen again? No, there are no regrets about my transition.

Anyone here experienced something similar?