Tierney is a distinctive girls' name in United States, ranking #1689 in 1998 with 95 recorded births. This places Tierney in the top 10% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2000 with 110 births ranking #1616. In 1998, approximately 1 in every 18,599 girls born was named Tierney. FALLING Recent data shows the name is currently falling.