I have to laugh at when they mock me for not being able to get certain names, and yet very few pronounce my name as it is here--even when I sit and coach them on it, they can't seem to get their heads around saying "Jana." I'm Gemma, Johna, Janet, etc. It doesn't bother me at all. I just view it as a regional/accent thing.
If they will learn to live with me not being able to always tell the difference between Perry and Parry, Berry and Barry, and occasionally forgetting and calling Graeme/Graham an American pronunciation of Graham, then I can forgive my name being different in everyone's mouths.
Although I did laugh when I sat with a woman in a new job and she tried valiantly to get it right, making me repeat it over and over, to no avail. When I asked what her name was, she replied "Jan." I said "well, there you go. It's "Jan" with an uh sound on the end. She went "Oh! Johnna!" I tried very hard not to laugh there and then. If Jan couldn't pronounce Jana, it just wasn't going to happen. Their heads were just too set in their idea of how my name "should" sound.

I think that's why I still sometimes get a little hesitant to say certain names, even after more than five years.