Joslyn is a distinctive girls' name in United States, ranking #928 in 2017 with 285 recorded births. The name reached its all-time peak in 2010 with 461 births ranking #641. Since 1996, the popularity has increased by 46.9%. In 2017, approximately 1 in every 6,056 girls born was named Joslyn. FALLING Recent data shows the name is currently falling.