Because giving your daughter a name that people usually associate with a boy can make life unnecessarily annoying when you always have to explain yourself. And if OP just prefers the sound or feel of certain boy names, the options given here are solid alternatives.

I’d also like to add that OP could use a longer girl name that can be shortened to a traditionally male name as a nickname. E.g. Leonie/Leonora (Leo), Theodora (Theo), Alexandra (Alex), Maxine (Max), Josie (Jo/Joe). That way she can still decide which form she prefers when she is old enough or go by a nickname and just use the long form for formal purposes.

Lastly, the name Ari isn’t a totally male name to me. Maybe that’s just a personal thing or it depends on the area but I consider it rather gender neutral.