That's terrible! So the registrar wasn't listening to whoever said "Her name is..." then?! He sounds like a bit of a twit (I'm assuming the registrar was a he...) How could someone just assume that the sex was one thing or another?
Mind you, I'd always thought Evelyn was a girl's name, just because I'd only ever heard it associated with women, until I heard of Evelyn Waugh. Hillary, simlarly, so I guess this person was biased the other way round.
Even so, it should still be a matter of protocol to actually *ask* what the sex was, though.