Casimiro is a distinctive boys' name in United States, ranking #8416 in 2005 with 8 recorded births. The name reached its all-time peak in 2000 with 12 births ranking #5627. Since 1996, the popularity has decreased by 20.0%. In 2005, approximately 1 in every 249,643 boys born was named Casimiro. FALLING Recent data shows the name is currently falling.