Arnaldo is a distinctive boys' name in United States, ranking #4017 in 2004 with 22 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 24.1%. In 2004, approximately 1 in every 90,218 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.