Character Names (Last, middle, and first)?

YAY! I FOUND SOMEBODY! I also am writing a book. I like the name Ivy. But Ash is from Pokemon, so dont use it. How about crash? Don't use Nixon as a last name,Its from a president. Addison is ok, how about Renesmee? I read twilight and i liked that name, but if you want this book to get published DONT use the name Renesmee. Hope i helped!