Wakanyeja is from the Lakota Wakȟáŋyeža — sacred child, holy child, those who come from the holy. Wakanyeja is one of the Lakota feminine + unisex names — central to traditional Lakota-Sioux Indigenous heritage of Great Plains United States.
Wakanyeja 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.
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In Pythagorean numerology the letters of Wakanyeja reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.