Joss \j(o)-ss\ as a boy's name (also used as girl's name Joss), is of Old German origin, and the meaning of Joss is "a member of the Germanic tribe, the Gauts". English name that is a nickname of Jocelyn, which used to be a masculine name. Also possibly a variant of Joseph. Actor Joss Ackland.
Joss has 2 variant forms: Joslin and Josslin.
For more information, see also the related name Joshua.