Blend of Jo (God will increase) and Lynn (lake), a mid-century compound name.
Jolynn is a compound American name, joining Jo — a familiar form of names like Josephine (from the Hebrew Yosef, "God will add") or Joan (from the Hebrew Yohanan, "God is gracious") — with Lynn, the Welsh name meaning "lake" or "waterfall." This kind of blended construction, combining two familiar name elements into a new whole, became a characteristic creative act in American naming culture, particularly from the 1930s through the 1960s, when Jo- compounds like JoAnn, Jolene, and Joanna were widely fashionable. Jo has long carried an independent, spirited literary character: Jo March in Louisa May Alcott's Little Women (1868) is among the most beloved fictional heroines in American literature — tomboyish, ambitious, fiercely loyal, ahead of her time.
Any name bearing the Jo element inherits a trace of that energy: the sense of a woman who will write her own story. Lynn adds to this a quieter, more contemplative register — still waters, reflection, natural depth. Jolynn sits in a particular mid-century American sweet spot — recognizably Southern in its blended warmth, optimistic in its sound, personal in its construction.
While it never achieved mass popularity, it was consistently chosen by parents who wanted something that felt both familiar and freshly their own. Today Jolynn has a pleasant vintage quality, belonging to the generation of handcrafted American names that are attracting renewed appreciation as parents seek names with genuine character rather than algorithmic trendiness. It is a name that sounds like someone you would trust.