Leah comes from the Hebrew Lēʾāh (לֵאָה), traditionally translated as "weary" — though some scholars suggest a connection to the Akkadian word for "cow," reflecting the agricultural setting of the patriarchs. In Genesis, Leah is the first wife of Jacob and the mother of six of his twelve sons, including Judah (ancestor of King David).
Leah has been continuously in use in Jewish communities for thousands of years and entered broader Christian use through Puritan and Protestant influence. Today it sits in the U.S. top 50 and is among the most commonly chosen Hebrew names in English-speaking countries — short, soft, biblical.
Leah 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 Leah reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.