Dempsey is a distinctive boys' name in United States, ranking #3746 in 2009 with 28 recorded births. The name reached its all-time peak in 2014 with 94 births ranking #1644. Since 1996, the popularity has increased by 27.3%. In 2009, approximately 1 in every 70,832 boys born was named Dempsey. FALLING Recent data shows the name is currently falling.