|Well, congrats. You discovered it. You get to name it.|
Although this article is based on canonical information, the actual name of this subject is conjectural.
As shown in Remember the Titans, Artemis was tasked with killing the Titan, Prometheus. She tried to kill him with this blade but it was knocked out of her hand, thanks to Prometheus' combat skills. Prometheus got hold of it and threatened Artemis with it. He demanded her to reveal who she was. Clutching the blade, Artemis teleported away.
As Prometheus was confirmed to be a Titan, based on the woman's fighting skills and her deft handling of the blade, Sam could identify the woman as Artemis.