I am dying to know this question for two reasons.
1. I have a character in the novel that i'm writing has the name of Murtagh. I didn't name the character, and I didn't come up with the name (my friend did). I only found out a few months into the project that my friend took the name from Eragon. I did more reaserch on it, and I found out its an irish surnmame, which is where Paolini probably got it from. So, should I change the characters name?
2. Thorn is not a very common name, and I'm thinking of using it for a character in an upcoming novel. However, it has been used in a fairly famous series: Bone. Even though Jeff Smith obviously got it from nature, should I still change it?
Please reply - I need to know.
Thanks.

