When I did my legal name change last year I had a count of 50+ places that I had to make the update (then I stopped counting, it was too stressful), but you're right, it does keep coming up. I haven't even thought as much about who has records of my gender! (Aside from the obvious ones, drivers license, birth certificate, etc.). When I contacted North Carolina State Univ. (where I did my undergrad) to change my name they actually asked if I wanted to update my gender as well - it hadn't occurred to me that they would even have that, but it makes sense. I throw that story in partly to show that even in North Carolina not everyone is transphobic :-) (Of course my sister lives there now, and she is transphobic, oh well)