Gwenllian is a distinctive girls' name in England & Wales, ranking #1639 in 2025 with 18 recorded births. The name reached its all-time peak in 2023 with 29 births ranking #1135. Since 1996, the popularity has increased by 12.5%. In 2025, approximately 1 in every 14,071 girls born was named Gwenllian. FALLING Recent data shows the name is currently falling.