Josselyn is an uncommon given name for females but a very popular last name for both adults and children (#34949 out of 150436, Top 23%).(2000 U.S. Census). Shown below is an analysis of the usage of the girl name Josselyn and associated names.Jocelyn (#114 the previous year) , Jocelyne, Jocelynn (#971) , Joseline, Joselyn (#619) , Joslyn (#871) and Joycelyn are the popular varying forms of Josselyn (not ranked) . Variants like Joslynn are seldom used.osselyn /jos-se-lyn/ [3 sylls.] as a name for girls is of Old German derivation, and Josselyn means a member of the German tribe, the Gauts. Josselyn is a version of Jocelyn (Old German). Kreatif forms: Josselynna, Josselynni, Juselyn.