Quite a bit it seems. So much it's giving Wendy Sparrow a good deal of trouble since she keeps changing her character's names. I can sympathize. When I was writing Schmitty the Pirate, names were the biggest challenge I faced. Of course, that was before I started querying. The antagonist changed names a bunch of times. Schmitty's father changed names a bunch of times. Schmitty's love interest changed names a bunch of times. Ship's names changed. Places names changed. I think the only thing that didn't change was Schmitty. Although, looking at my original notebook, I didn't know how to spell it. I found both Schmitty and Smitty within the same paragraph a few times. I don't know why I settled on one over the other, but it seems a symptom of something I've been dealing with my whole life.
When I was born, my parents named me Chris. Three days later they changed it to Matt, claiming I didn't look like a Chris. What newborn looks like anything, other than a wrinkly, pink mess? Then there was the running joke I was actually called Julio, because I had been made in Spain. And there was a family friend who insisted on calling me George. I never knew why, but his whole family called me George. I don't think they knew my real name, but at this point neither did I. And then, a few years back, I moved into a new house and my next door neighbor started calling me Dwayne. I don't think I caught it the first few times he said it, but by the time I realized it, it was too late to say anything. I'd been answering to Dwayne, and so I had to become Dwayne. I didn't want to embarrass him and got away with it for two years, until my wife outed me.
Alas, I fear this will never end. Even when I tell people my name they get it wrong. I must speak too fast. My last name starts with a C, so when I say Matt C***, people hear Mac. And so, I'm Mac. So be it. No one can pronounce my last name anyway.
The point is, character names are important. I try to give them meaning. Schmitty's real name is Alistair, which means defender of the people. And he does a lot of that. I changed the name of an evil parrot to Matata, which is Swahili for trouble maker. And he certainly is.
And so is this name business. I don't always put that much thought into it. I probably should. How do you name your characters?