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 reduces to one — the number of youthful.