I have a friend who was going to name her daughter Penelope. Then one of the Kardashians gave birth to a girl and named her Penelope. My friend's daughter is now named Scarlett :)
Another friend of mine went into a panic when Angelina Jolie was pregnant and it was reported that Isla was in the running for a girl's name. Thankfully Shiloh Jolie-Pitt was born, so my friend's daughter was able to be Isla.
Would you change your child's name if somebody ridiculously famous gave birth a month or so before you and used the name you had chosen?
NO i wouldn't....It's not like I am friends with these famous people. I would only consider changing a name I had chosen if a friend or family member decided to use it.
I would reconsider it depending on the celebrity. We were going to name our first boy Mac but 2 weeks before our child was born, "close enough" friends named there boy that. Luckily we had a girl! My husband was the one that didn't want the same name so we named our boy, Vance.