That’s assuming someone is given the name “Christopher” or “Christine” but if a parent names a kid “Chris” then “Chris” is the kids name, so “Chris” is a name without M/F equivalent.
There are a lot of wacky names out there. I knew a girl once named “Destiny.” Or how about old-fashioned girl names like “Chastity” or “Prudence”? It’s hard to think of male equivalents to those.