Wairimu is one of the Kikuyu feminine clan names — central to traditional Kikuyu cultural heritage. Kikuyu feminine clan name in modern Kenya.
Wairimu 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 Wairimu reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.