Jill
Jill began as a medieval diminutive of Juliana or Gillian, both of which derive from the Latin "Iulianus" (youthful). The name is essentially a short form that became established as a standalone name in the 20th century. The name has been part of English folklore for centuries — "Jack and Jill" is one of the oldest nursery rhymes in the language. Jill was a top-100 American name from 1955 to 1975, peaking at #49 in 1965. The peak was so concentrated that Jill now reads as definitively mid-century. Jill Biden (born 1951), First Lady during Joe Biden's presidency, has been the most prominent modern bearer. Jill Scott (born 1972), the singer-songwriter, gave the name a soul dimension. I find Jill has a brisk, friendly quality — the single syllable is direct, and the "J" opening is firm. The name has been outside the US top 1000 since 2006 and is unlikely to return soon. Jill is a female name of Latin (via English) origin that means "Youthful (from Juliana/Gillian)". Brisk, friendly, and mid-century. The name sounds cheerful. Jills tend to be direct. US peaked #49 in 1965. Outside top 1000 since 2006. Well-known people named Jill include Jill Biden (First Lady), Jill Scott (singer), Jill (Jack and Jill rhyme), Jill (fictional, various). Common variations and related forms of Jill include Jillian (full form), Jilly (nickname), Gillian (related), Jil (variant).