We have the Olympian goddess Artemis whom Diana does occasionally interact with. You have Diana's fellow Amazon Artemis of the Bana-Mighdall. In pre-crisis, Diana fought the reanimated corpse of an ancient Amazon named Artemis. And this is just characters in the Wonder Woman corner of the DCU. We have the villainess (hero in the YJ animated series) Artemis Crock aka Tigress and Artemiz, a Female Fury who appeared in Ostrander's Suicide Squad.