The variants that I found listed for Cornelius are Corny and Corney. I'd rather be a Connie than a Corney meownself BTW, both my sisters have names that can go either way as well...Christy and Kelli. Kelli married a Kelley and for the life of us we can't think of a better way to refer to them (at least one that will stick!) than Kelli girl and Kelley boy.