There are multiple origins and translations for the hugely popular name Helen:
1. Ancient Greek name which actually means - "daughter of Helios (sun)", comes from the ancient Greek word (ἥλιος) [Ilios] and translates as - "sunny, solar".
2. Comes from the English word Hellene and interpretation is - "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.