Tierney is a distinctive girls' name in England & Wales, ranking #822 in 2002 with 29 recorded births. The name reached its all-time peak in 2000 with 54 births ranking #524. Since 1996, the popularity has increased by 52.6%. In 2002, approximately 1 in every 9,220 girls born was named Tierney. FALLING Recent data shows the name is currently falling.