A character named Electric Eve with the same powers and affiliation with the Morlocks debuted in X-Men Millennial Visions vol.2 but since that was a theorized story idea her actual debut in the Main Marvel Universe is in Morlocks #1.
The name Weena Morloch came from the H.G. Wells book The Time Machine ("Weena" is the name of the girl that the unnamed male protagonist develops a close loving relationship with in the future world he travels to, and the name "Morloch" is derived from the Morlocks, the cannibalistic hominids).