I don't understand this.
Miles brings to mind
Miles Davis and many other literary characters.
Eowyn is the name of a female in exceedingly popular films. Neither are even remotely androgynous. Plus Miley is such a stupid nn - and a total celebrity rip-off at that.
A kid is going to have to live with their name. While I can see a female
Miles somewhat well I cannot imagine a happy male
Eowyn.