Fionna is a distinctive girls' name in United States, ranking #9926 in 2022 with 10 recorded births. This places Fionna in the bottom 44% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2012 with 41 births ranking #3804. Since 1996, the popularity has decreased by 16.7%. In 2022, approximately 1 in every 163,876 girls born was named Fionna. FALLING Recent data shows the name is currently falling.