Grainne is a distinctive girls' name in United States, ranking #10512 in 2002 with 9 recorded births. The name reached its all-time peak in 2002 with 9 births ranking #10512. Since 1996, the popularity has increased by 80.0%. In 2002, approximately 1 in every 199,647 girls born was named Grainne. STABLE Recent data shows the name is currently stable.