Riannah is a distinctive girls' name in United States, ranking #18569 in 2005 with 5 recorded births. This places Riannah in the bottom 3% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2006 with 20 births ranking #6551. In 2005, approximately 1 in every 369,540 girls born was named Riannah. FALLING Recent data shows the name is currently falling.