Rennie is a distinctive boys' name in United States, ranking #8262 in 1998 with 7 recorded births. The name reached its all-time peak in 2003 with 9 births ranking #7700. Since 1996, the popularity has increased by 16.7%. In 1998, approximately 1 in every 273,045 boys born was named Rennie. FALLING Recent data shows the name is currently falling.