Casimiro is a distinctive boys' name in United States, ranking #12831 in 2008 with 5 recorded births. The name reached its all-time peak in 2000 with 12 births ranking #5627. Since 1996, the popularity has decreased by 50.0%. In 2008, approximately 1 in every 407,989 boys born was named Casimiro. FALLING Recent data shows the name is currently falling.