Roisin is a moderately popular girls' name in England & Wales, ranking #399 in 2005 with 97 recorded births. The name reached its all-time peak in 1997 with 158 births ranking #247. Since 1996, the popularity has decreased by 27.6%. In 2005, approximately 1 in every 2,972 girls born was named Roisin. FALLING Recent data shows the name is currently falling.