I have a somewhat unusual last name and have dealt a lot with people misspelling and mispronouncing it. I try not to have emotional feelings about it, or I would have a severe complex about it by now. I have watched people take a drivers license or credit card and copy my name off it and write it down wrong. It's like their brain insists that it is another more common name so they can't see what it actually is.

I wanted to suggest the possibility that your therapist may be a very bad speller. Some people just are.

If you feel able, you could ask him to greet you with your full name at the beginning of the session until he learns to say it. You could just say that it makes you feel a little "insecure" (or some other adjective) that he doesn't know how to say your name and ask him to learn to say it.

I am probably coming from the point of view that I have because of so many people misspelling and mispronouncing my name.