Cosmo is a distinctive boys' name in United States, ranking #5138 in 2009 with 18 recorded births. This places Cosmo in the top 35% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2022 with 99 births ranking #1708. In 2009, approximately 1 in every 110,184 boys born was named Cosmo. FALLING Recent data shows the name is currently falling.