Nikita is from the Greek nīkē (νίκη — victory) + diminutive feminine suffix — also a Russian-Slavic masculine name historically. adopted by Western pop culture as feminine. Luc Besson's La Femme Nikita (Nikita) (1990) is a French neo-noir action thriller directed by Luc Besson — widely considered one of the works of modern French cinema and a example of the female-assassin genre. The Nikita franchise has grossed over $300 million worldwide and remains a reference in the female-assassin genre alongside Kill Bill and Atomic Blonde.
Nikita 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 Nikita reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.