Rainier is a distinctive boys' name in United States, ranking #3693 in 2019 with 30 recorded births. The name reached its all-time peak in 2023 with 41 births ranking #3045. Since 1996, the popularity has increased by 233.3%. In 2019, approximately 1 in every 59,779 boys born was named Rainier. FALLING Recent data shows the name is currently falling.