Norah is the Irish form of Eleanor — itself ultimately from the Latin honor, meaning "honour," or the Greek helene, meaning "light" or "sun's ray." The H spelling is the older Irish form; Nora (without the H) is the simpler modern variant.
Norah has been continuously used in Ireland for centuries and in the U.S. for a hundred years. Today Norah sits in the U.S. top 100 and is climbing fast.
Norah 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 Norah reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.