Sinead is a moderately popular girls' name in England & Wales, ranking #188 in 1999 with 234 recorded births. The name reached its all-time peak in 2003 with 312 births ranking #154. Since 1996, the popularity has increased by 15.8%. In 1999, approximately 1 in every 1,204 girls born was named Sinead. FALLING Recent data shows the name is currently falling.