Dennison is a distinctive boys' name in United States, ranking #11309 in 2003 with 5 recorded births. This places Dennison in the bottom 11% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2000 with 17 births ranking #4440. In 2003, approximately 1 in every 395,054 boys born was named Dennison. RISING Recent data shows the name is currently rising.