Tierney is a distinctive girls' name in England & Wales, ranking #718 in 2005 with 42 recorded births. The name reached its all-time peak in 2000 with 54 births ranking #524. Since 1996, the popularity has increased by 121.1%. In 2005, approximately 1 in every 6,863 girls born was named Tierney. FALLING Recent data shows the name is currently falling.