Nasieku is from the Maasai Nasieku — bracelet. Nasieku is one of the Maasai feminine names — central to traditional Maasai pastoral + Indigenous Kenyan-Tanzanian heritage. The Maasai feminine nai- prefix is central to traditional Maasai naming alongside Naserian (the one who comes from the desert), Nayieyo (the prayed-for one), Nasieku (the bracelet), Naipanoi (the tall wise one).
Nasieku 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 Nasieku reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.