I live in the Midwestern US and
Aaron and
Erin are pronounced the same here although I think it would more accurate to label them as different names that happen to be pronounced the same. I think if people here viewed them truly as unisex they would use the spellings interchangibly for both sexes which is not the case.
Aaron is used exclusively for boys and
Erin exclusively for girls.
“It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.”
~Mark Twain