Had to rename one of my characters about 130 pages in and found it traumatic. I'd gotten used to thinking of him a certain way. I should backtrack and say that I take naming characters seriously. I look up names and their meaning, I look at family patterns in naming children, and so on. I think names affect the reader on a subconscious level. So, neurotic me, I took a week to come up with another satisfactory name. One small complication is that I had made the meaning of the name significant, in a minor way, and wanted to preserve that little scene.
Upcoming news: I'm starting another blog in partnership with a talented writer so stay tuned for details when we get that up and running. Should be fun if you love books as well as the nuts and bolts of narrative.