There are multiple origins and meanings for the name Helen:
1. Greek name, meaning - "daughter of Helios (sun)", comes from the ancient Greek word (ἥλιος) [Ilios] meaning - "sunny, solar"
2. Comes from the English word Hellene etymology "Greek (girl/woman)".
Saint Helen, Helena Augusta, and Helena of Constantinople, (AD c. 248 - c.329) was the first wife of Constantius Chlorus, and the mother of Emperor Constantin the Great. She is traditionally credited with finding the relics of the True Cross.