Rainen is a distinctive boys' name in United States, ranking #7993 in 2010 with 10 recorded births. This places Rainen in the bottom 44% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2009 with 18 births ranking #5261. In 2010, approximately 1 in every 191,841 boys born was named Rainen. FALLING Recent data shows the name is currently falling.