Wanjiku is one of the names of the nine daughters of Mumbi, the legendary mother of the Kikuyu people of Kenya.
Wanjiku is widely used among the Kikuyu and in the Kenyan diaspora.
Wanjiku 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 Wanjiku reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.