Meaning and name origin
Joslin \j(o)-slin, jos-lin\ as a boy's name (also used as girl's name Joslin), is of Old German origin, and the meaning of Joslin is "a member of the Germanic tribe, the Gauts". Joslin is a variant of Joss (Old German): English name that is a nickname of Jocelyn, which used to be a masculine name.
Joslin is not a popular first name for males but a very popular surname or last name for all people (#5029 out of 88799, Top 6%) (2000 U.S. Census).
Displayed below is the baby name popularity of the name Joslin for boys (2014 statistics).