Roisin is a moderately popular girls' name in England & Wales, ranking #333 in 2001 with 106 recorded births. The name reached its all-time peak in 1997 with 158 births ranking #247. Since 1996, the popularity has decreased by 20.9%. In 2001, approximately 1 in every 2,528 girls born was named Roisin. FALLING Recent data shows the name is currently falling.