I can't see a reason why they would get in an uproar about you changing your name. Lots of people change their name because they feel like it. Are you changing it to something that can in-no-possible-way also be used for a female? Today, I am more and more seeing names become gender neutral, and in some places (like the south, I've heard) they like to give girls male names, and think it's cute, or something. Anyway, just by changing your name alone, even to a strictly male name, I can't see why anyone would care. If I knew a girl who changed their name to a strictly male name, the first thing that comes to my mind would NOT be "oh, they must be transgender."
Now if you also change your gender on there, that could raise some flags, but if I wanted to do that and still not come out, I would be like, "oops, my mistake. I'll change it sometime." and then not change it. lol.