Fionnuala is a distinctive girls' name in United States, ranking #16293 in 2002 with 5 recorded births. This places Fionnuala in the bottom 10% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2010 with 12 births ranking #9416. In 2002, approximately 1 in every 359,364 girls born was named Fionnuala. FALLING Recent data shows the name is currently falling.