Cullin is a distinctive boys' name in United States, ranking #4051 in 1998 with 17 recorded births. This places Cullin in the top 36% 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 23 births ranking #3558. In 1998, approximately 1 in every 112,430 boys born was named Cullin. FALLING Recent data shows the name is currently falling.