In German, name Joscelin means – Variant of Jocelyn: One of the Goths. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century.. Other origins for name Joscelin include – German, Latin-American. Name Joscelin is a unisex name and can be used for a boy or girl name (male or female).