Joslyn is a distinctive girls' name in United States, ranking #1405 in 2021 with 155 recorded births. The name reached its all-time peak in 2010 with 461 births ranking #641. Since 1996, the popularity has decreased by 20.1%. In 2021, approximately 1 in every 10,579 girls born was named Joslyn. FALLING Recent data shows the name is currently falling.