My T called me Rachel a few times in session. At least it was consistent lol. But one time I was in the waiting room and didn't hear her calling my name, so she snuck up beside me. I was like "omg, I'm so sorry, I was totally caught up on my phone". In session she kept calling me Rachel and I was like " Its Sienna" and she stared at me and then said "that explains why you didn't hear me calling you in the waiting room ". We both laughed it off. I've been called a lot of names over the years - Sara, Sierra, Anna. It happens.
I'm also in a profession where I should probably remember peoples names better than I do, so I often default to "hey buddy!"