Tell your sister congratulations from me.
First of all: if you like the name, and want to consider it, i'd have quite a few names handy. Mecca kinda has a ring to it. But wait till the baby's born, and if you still like it go ahead.
Secondly, i'm sure nobody will mind about the whole mecca: religion stuff. There's a girl at school called priya and I never heard of that name before, but I just thought; its her name. And the more I knew her, the more priya's name suited her.
Thirdly, what does the name mecca mean? I'm sure at some time in her life this lil kid's going to want to know what her name means. And if it has something like: 'muslim', what will she think of that?
Fourthly, I love this name. And if you like it, and your sister likes it, and the father likes it: I see no reason why it shouldn't come into the final list.
Fifth, the name will change. It happens to everyone. You like it, then you don't. It's just the way it is. I had 17 names before this one. So if mecca is chosen at some point, it might not be the final decision.
Finally, what does your sister think of when she imagines mecca as a child? What kind of personality does mecca come across to her?
Well, big congrats from me, I hope this helped. I can't believe how much I think about it: i'm 13!
.:huggles:. Good luck!