Norma is from the Latin norma ("standard, rule, measure, square") — the carpenter's square that gave us the word normal. Norma Jeane Mortenson was Marilyn Monroe's birth name.
Norma 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 Norma reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.