Arihia is from the Maori Arihia — Maori rendition of Alice / Alesia — from the Greek Alethea (truth) or Germanic Adelheid (noble). Arihia is one of the Maori feminine names — central to traditional Maori-Christian post-colonial adapted heritage.
Arihia 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 Arihia reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.