Nneka is an Igbo (Nigerian) name combining nne (mother) and ka (is supreme/greater) — meaning "mother is supreme." The name carries the Igbo proverb that maternal lineage holds the highest reverence.
Nneka Egbuna (born 1981), the Nigerian-German singer, is the most internationally known bearer.
Nneka 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 Nneka reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.