Rainier is a distinctive boys' name in United States, ranking #5513 in 2005 with 15 recorded births. The name reached its all-time peak in 2023 with 41 births ranking #3045. Since 1996, the popularity has increased by 66.7%. In 2005, approximately 1 in every 133,143 boys born was named Rainier. FALLING Recent data shows the name is currently falling.