Tirzah (תִּרְצָה) is a Hebrew name meaning "she is my delight" or "pleasantness." In the Book of Numbers, Tirzah is one of the five daughters of Zelophehad who successfully petitioned Moses for inheritance rights. Also the name of an ancient Canaanite city.
Tirzah is widely used in religious Jewish and Christian families.
Tirzah 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 Tirzah reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.