Jocelyn is a surname and first name. It is a unisex (male/female) name. Variants include Jocelin, Joceline, Jocelyne, Jocelynn, Jocelynne, Joscelin, Josceline, Joscelyn, Joscelynn, Joscelynne, Joseline, Joselyn, Joselyne, Joslin, Joslyn, Josselin, Joslynn,Josselyn, and Josslyn. The name may derive from Josselin, a locality in Brittany, France, and have been introduced to England after the Norman Conquest. It may also derive from the Germanic name Gauzlin, also spelled Gozlin or Goslin. It is Latinized as Iudocus or Judocus, from Breton Iodoc, diminutive of iudh ("lord").

In French, the spelling "Jocelyn" is exclusively male. The female counterpart is spelled "Jocelyne".