Naoise is from the Old Irish — possibly meaning warrior or champion; a male name historically used for both genders in modern Celtic revival naming. Yeats (Deirdre, 1907), J.M. Synge (Deirdre of the Sorrows, 1910), and James Stephens (Deirdre, 1923); the tale of Naoise and Deirdre remains one of the love stories in Irish literary heritage. Naoise Roo — Irish singer-songwriter. Naoise Mac Suibhne — Irish actor.
Naoise 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 Naoise reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.