Artemis can also be a boy's name, despite the goddess being female. My (male) cousin has Artemis as a middle name, and in the Artemis Fowl series the titular character is male.
If you name a boy Artemis, would you name a girl after a GOD? Artemis was a Goddess not a god. For boys you could use Apollo, the twin brother of Artemis. This is better for girls and much better than Diana, which is overused and boring. There are masculine forms.