Mars is also used as a feminine name in Roman Mythology. However, it's more common for males. So, I think that the "Gender" of this name should be updated from "Masculine" to "Masculine & Feminine". A known female bearer of this name is Mars Argo, an Internet YouTube personality.Sources: https://en.m.wikipedia.org/wiki/Mars_(disambiguation) https://en.m.wikipedia.org/wiki/Mars_Argo
Prince Mars, also known as Prince Marth, is a principal character in two of the Fire Emblem video game series, as well as the Fire Emblem anime. He is also an unlockable character in Super Smash Brothers Melee.
Sources:
https://en.m.wikipedia.org/wiki/Mars_(disambiguation)
https://en.m.wikipedia.org/wiki/Mars_Argo