Rainier is a distinctive boys' name in United States, ranking #9160 in 2002 with 7 recorded births. This places Rainier in the bottom 27% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2023 with 41 births ranking #3045. Since 1996, the popularity has decreased by 22.2%. In 2002, approximately 1 in every 277,353 boys born was named Rainier. FALLING Recent data shows the name is currently falling.