the meaning of Helena is "sun ray, shining light".
In ancient Greece, the appearance of a single glowing ball of light (also called St. Elmo's fire) was called Helena and two were called Castor and Pollux
Helena is a cognate of the Greek Helenē, which is derived from the root ēlē (light, torch, bright). The name is borne in Greek legend by the beautiful wife of the king of Sparta. Her abduction by the Trojan prince Paris sparked off the Trojan War.