To me the greater indication of sexism is not that people give formerly "male" names to girls, but that when a formerly male name starts being given regularly to girls, people usually STOP giving it to boys. That's more a sign that the culture thinks there is something "bad" about being female or "better" about being male. If we really had an equal view, formerly "female" names would be given to boys as often as formerly "male" names are given to girls, and Americans would still be naming lots of boys
Ashley,
Madison,
Lindsay,
Mackenzie,
Meredith,
Sydney,
Tracy, etc.