My protagonist's name is Karla, named after Hurricane Carla, with the first letter changed. Today I decided to change her name to Carla with a "C" because I don't think people back in the '60s played around with names that much. Do you agree or disagree?
I don't think it matters. The 'playing around with names' thing goes back a lot further than the '60s.
Do you mean the 60s where Frank Zappa named his sons Moon Unit and Dweezil? Edited to Add: Here's a list of the most popular names of the 1960's. Karla is number 195 but that's still 17,713 babies.