Roisin is a distinctive girls' name in England & Wales, ranking #643 in 2015 with 64 recorded births. The name reached its all-time peak in 1997 with 158 births ranking #247. Since 1996, the popularity has decreased by 52.2%. In 2015, approximately 1 in every 4,811 girls born was named Roisin. FALLING Recent data shows the name is currently falling.