Modern American combination of Jeri (variant of Jerry, from Hebrew Jeremiah) and Lynn (Welsh 'lake').
Jerilynn is a compound name, a practice with deep roots in American naming culture, blending Jerry or Geri — itself a shortened form of names like Gerald, Geraldine, or Jerome — with the suffix Lynn, derived from the Welsh *llyn*, meaning lake or pool. Gerald and Geraldine trace back to the Old High German *Gerwald* or *Gerold*, a compound of *ger* (spear) and *wald* (rule), meaning something like "spear ruler" or "one who governs by the spear" — a name of medieval Germanic warrior aristocracy. Jerome, an alternative root for the Jerry element, comes from the Greek *Hieronymos*, meaning "sacred name," and was made famous by the great biblical scholar Saint Jerome.
The Lynn suffix, when appended to other name elements, softens and musicalizes the base name, a practice that became particularly fashionable in the mid-twentieth century United States. Names like Carolyn, Marilyn, Jacquelyn, and a host of compound forms — Bobbylyn, Sondralyn, Jerilynn — were characteristic of a creative American naming exuberance that treated the name as a personal art form rather than a fixed inheritance. This period produced a constellation of combination names that now carry a distinctly mid-century American flavor, evoking the postwar decades when optimism about the future ran high and individuality was expressed through small creative acts.
Jerilynn is a name that wears its era openly and honestly, and in an age of renewed appreciation for vintage Americana, it carries a nostalgic warmth. It suggests a woman of a certain generation — resourceful, warm, and unpretentious — while offering contemporary bearers the pleasure of a name genuinely uncommon in younger cohorts, a true original rather than a trend-follower.