Rainier is a distinctive boys' name in United States, ranking #4279 in 2013 with 23 recorded births. The name reached its all-time peak in 2023 with 41 births ranking #3045. Since 1996, the popularity has increased by 155.6%. In 2013, approximately 1 in every 82,228 boys born was named Rainier. FALLING Recent data shows the name is currently falling.