Rachael is the alternate biblical spelling of Rachel — from the Hebrew Rachel ("ewe, female sheep") — the matriarch of Genesis, wife of Jacob and mother of Joseph and Benjamin. Rachael Yamagata (born 1977) — Japanese-American singer-songwriter. Rachael Pelosi — Nancy Pelosi's daughter. Saint Rachel (Rachael) in the Hebrew Bible is one of the four biblical matriarchs (with Sarah, Rebecca, and Leah).
Rachael 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 Rachael reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.