Marit is from the Norwegian / Sami Marit — Norwegian-Sami rendition of Margaret. Marit is one of the Norwegian + Sami feminine names — central to traditional Norwegian Lutheran + Sami Indigenous heritage. Norwegian feminine name.
Marit 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 Marit reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.