Rosslyn is a distinctive girls' name in United States, ranking #7345 in 2008 with 18 recorded births. This places Rosslyn in the top 36% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2015 with 33 births ranking #4386. In 2008, approximately 1 in every 105,040 girls born was named Rosslyn. FALLING Recent data shows the name is currently falling.