Hannah comes from the Hebrew Ḥannāh (חַנָּה), meaning "grace" or "favour." In the Hebrew Bible, Hannah is the long-childless wife of Elkanah who prays so fervently at the temple that the priest Eli initially thinks she is drunk; her prayer is answered, and she becomes the mother of the prophet Samuel.
The name has been continuously used in Jewish communities for nearly three thousand years.
Hannah 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 Hannah reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.