Helena is the Latinised form of the Greek Helene (Ἑλένη) — meaning "sun's ray" or "bright." Helen of Troy, whose face launched a thousand ships in Homer's Iliad, was the most famous Greek Helen.
Helena has been continuously used across Europe for two thousand years. Today it sits in the U.S. top 350 and is rising.
Helena does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Helena reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.