Dempsey is a distinctive boys' name in United States, ranking #2596 in 2010 with 47 recorded births. The name reached its all-time peak in 2014 with 94 births ranking #1644. Since 1996, the popularity has increased by 113.6%. In 2010, approximately 1 in every 40,817 boys born was named Dempsey. FALLING Recent data shows the name is currently falling.