Tierney is a distinctive girls' name in United States, ranking #2340 in 2005 with 77 recorded births. The name reached its all-time peak in 2000 with 110 births ranking #1616. Since 1996, the popularity has decreased by 24.5%. In 2005, approximately 1 in every 23,996 girls born was named Tierney. FALLING Recent data shows the name is currently falling.