Variant of Jocelyn, from a Germanic tribal name (Gauts) adopted into Old French.
Joscelyn traces its roots to the Germanic tribal name Gautzelin, derived from the Gauts — a Gothic people whose name may connect to the Old Norse word for "God." The Normans carried the name into England after 1066 as Joscelin or Jocelin, where it initially flourished as a masculine name among the Anglo-Norman nobility. Medieval records show earls, bishops, and knights bearing the name throughout the 12th and 13th centuries, making it a prestige marker of the ruling class.
Over the centuries, Joscelyn underwent one of the more dramatic gender migrations in English naming history, transitioning from an almost exclusively male name to a predominantly female one by the 20th century. The spelling with a 'y' — Joscelyn — represents the more archaic and literary rendering, favored by parents who wanted to signal historical depth. It retains a subtle medievalism that plainer variants like Jocelyn lose.
Today Joscelyn occupies a pleasing middle ground: recognizable but not ubiquitous, feminine but carrying a certain structural strength inherited from its knightly past. It appears in genealogical records as a surname across English-speaking countries, and bearers of the name often discover ancestors who wore it as a proud masculine given name — a history that lends the contemporary feminine form an unexpected richness.