Hekla is the name of Iceland's most famous volcano — known in medieval Europe as "the Gateway to Hell." The word means "hooded cloak" in Old Norse, describing the volcano's cloud cap. A traditional Icelandic feminine name.
Hekla is widely used in Iceland.
Hekla 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 Hekla reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.