Modern diminutive, a pet form of Jacinda or a feminization of Jason/Jace.
C." — a tradition of initial-names that flourished particularly in the American South and Midwest throughout the nineteenth and twentieth centuries. It also functions as a creative variant of Jaci, Jacey, or Jacee, names that may derive from the Greek *hyakinthos*, the mythological flower associated with beauty and mourning, or as a feminization of Jason, itself rooted in the Greek *iaomai*, meaning "to heal."
The hyacinth connection places Jacie in distinguished mythological company: Hyacinthus was a Spartan youth of extraordinary beauty beloved by Apollo, whose accidental death gave rise to the flower that bears his name. Whether or not parents choosing Jacie are aware of this lineage, the name carries the floral lightness that connection implies. More pragmatically, Jacie emerged in American naming records as a fresh alternative for parents who loved the sound of Stacy, Tracy, or Macy but wanted something less familiar.
Today Jacie is rare enough to feel genuinely distinctive while phonetically accessible enough to require no explanation. It belongs to a family of names — Kacie, Lacie, Gracie — that share a sweet, melodic quality and a certain unpretentious femininity. The spelling with a *J* gives it a slightly bolder, more energetic character than its cousins, suggesting a name that's comfortable charting its own course.