Helle (Ἕλλη) is the Greek princess who, fleeing her stepmother Ino with her brother Phrixos on the Golden Ram, fell from the sky into the strait between Europe and Asia. The Hellespont ("Helle's sea") — the modern Dardanelles — is named after her.
Featured in Pindar's poetry and Apollonius's Argonautica.
Helle 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 Helle reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.