Marjan is from the Persian / Arabic مرجان (Marjān — coral, pearls). Marjan is one of the Persian + Arabic feminine names — central to traditional Persian + Muslim heritage.
Marjan 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 Marjan reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.