Nusayba is from the Arabic نسيبة (Nusaybah — noble, of noble lineage) — from Arabic nasab (lineage). Nusayba is one of the Arabic feminine names — central to traditional early Islamic heritage.
Nusayba 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 Nusayba reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.