The name Pelagia is a girl's name of Greek origin meaning "the sea". Pelagia and is often added to lists like Summer Baby Names and discussed in our forums with posts like "Release the 20 C.O.B.R.A.S. -- the anti-elimination game! (Girls)".
From the experts:
The name of several early saints, including one, Pelagia the Penitent, a beautiful and licentious dancing girl who repented, then, disguised as a man, spent the rest of her life living alone in a cave on the Mount of Olives. Because of her early vocation, she is the patron saint of actresses.