My real name is "Diane", spelled the common,normal way that name is spelled. The ex-principal of my son's school, who is my friend, also, always calls me "Diana". I corrected her once, but, don't make a fuss about it because I like her very much, and don't want to offend her.
I'm Catholic, also, and was baptized as "Diane Marie". Our priest, who was the pastor of our church from before I was born until we moved away when I was 20, always said that while there may not have been an official St. Diane canonized by the church with an official feast day, surely in the past 2000 years, there has been a St. Diane. So, he would readily baptize any person with a reasonable name.
My last name is another issue. It is originally Ukrainian/Polish, and so is a transliteration from another alphabet. It is spelled phonetically, and is pronounced just exactly as it is spelled. Very simple. It amazes me how people can mispronounce something that is pronounced just exactly it is spelled if you follow the usual, customary spelling rules that we all were taught in early elementary school.
On the other hand, I taught high school chemistry briefly. I had a girl in class at one time whose name was "Renae". I mispronounced that name, because I had never seen that particular variant of "Renee". Now I know. In the same class, I had a girl named "Tonya", which, she explained to me, I mispronounced. When I speaK, I wouldn't distringuish in pronunciation between "Tanya" and "Tonya". I would roughly pronounce them both "Tahn-ya". But, the girl in question told me that her name was pronounced "Toney-ya". And "Tanya" should be pronounced "Tan-ya". Whatever. Depends on where you're from.