Minoo is from the Persian mīnū (مینو — heaven, paradise, the celestial garden). Minoo Hamzeh-Naseri — modern Iranian-American figure. Princess Minoo — modern Persian royal heritage naming.
Minoo 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 Minoo reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.