Saga is the Old Norse word for "story" or "told tale" — and the name of the Norse goddess of poetry and history, companion of Odin.
Saga is among the most popular contemporary girl names in Sweden — frequently in the top 20.
Saga 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 Saga reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.