Joslyn is a distinctive girls' name in United States, ranking #717 in 2013 with 385 recorded births. The name reached its all-time peak in 2010 with 461 births ranking #641. Since 1996, the popularity has increased by 98.5%. In 2013, approximately 1 in every 4,557 girls born was named Joslyn. FALLING Recent data shows the name is currently falling.