Cullin is a distinctive boys' name in United States, ranking #7703 in 2007 with 10 recorded births. This places Cullin in the bottom 46% 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. Since 1996, the popularity has decreased by 44.4%. In 2007, approximately 1 in every 207,524 boys born was named Cullin. FALLING Recent data shows the name is currently falling.