It always was Mary and it always will be Mary - as long as people keep reading the Bible. Which is probably why John remains the most common boy's name. All these creative modern names for girls is wonderful, but you did ask what was the MOST popular name. And that's it: Mary. For me, Amy has been the center of my universe for over fifty years, but it's the personality and not the name that means so much.... But a rose by any other name would smell as sweet - whatever you have is just fine!