Jill is the English diminutive of Gillian — itself from the Latin Iuliana (feminine of Julius, "youthful, of Jupiter"). "Jack and Jill went up the hill" — the English nursery rhyme dates to at least 1765. A top-50 US baby name from 1965 to 1975. Jill Biden (born 1951) — First Lady of the United States 2021-2025; the first First Lady to maintain a full-time paid job (English professor at Northern Virginia Community College) during her tenure; PhD in Education from the University of Delaware (2007). Eight years as Second Lady (2009-2017) — among the longest-serving Second Ladies in US history. Co-founded the Biden Cancer Initiative with Vice President Biden after their son Beau's 2015 cancer death. Jill Scott (born 1972) — American Grammy-winning soul singer; Who Is Jill Scott? (2000). Jill Stein (born 1950) — Green Party presidential candidate (2012, 2016, 2024).
Subject of Jill: A Biography of the First Lady (Julie Pace, 2022).
Jill 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 Jill reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.