Rossalyn is a distinctive girls' name in United States, ranking #16036 in 2005 with 6 recorded births. This places Rossalyn in the bottom 16% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2005 with 6 births ranking #16036. In 2005, approximately 1 in every 307,950 girls born was named Rossalyn. FALLING Recent data shows the name is currently falling.