We named our firstborn Abel. What should we name our second baby if it's a girl?

We really like Arabella, but are afraid it sounds too much like Abel. We also want to use variation with our kid's names and are not trying to do an A pattern or anything. Would it be wired to have the first two kids named with the letter A and then the next kids with different letters? Any other suggestions? We like feminine/girly type names.