Tierney is a distinctive girls' name in United States, ranking #2155 in 2011 with 89 recorded births. The name reached its all-time peak in 2000 with 110 births ranking #1616. Since 1996, the popularity has decreased by 12.7%. In 2011, approximately 1 in every 19,762 girls born was named Tierney. FALLING Recent data shows the name is currently falling.