This really is a name which should be considered to be differently gendered depending on the spelling, like
Frances and
Francis.
Artemis is the name of a goddess and should be for a girl.
Artemas and Artemus are male. The character in the TV show and more recent film "The Wild Wild West" was Artemus
Gordon. Artemas of Lystra is a man mentioned in the book of
Titus in the New Testament. He is considered a saint by both the Catholic and Orthodox churches.
Artemas was a male name in Greece which meant "gift of the goddess
Artemis." The pronunciations were probably more different in Greek 2000 years ago than they are in modern English.
https://biblehub.com/topical/a/artemas.htm