Oonagh is a distinctive girls' name in England & Wales, ranking #2440 in 2025 with 11 recorded births. The name reached its all-time peak in 2022 with 16 births ranking #1767. Since 1996, the popularity has increased by 57.1%. In 2025, approximately 1 in every 23,026 girls born was named Oonagh. STABLE Recent data shows the name is currently stable.