Arnaldo is a distinctive boys' name in United States, ranking #3488 in 1999 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 1999, approximately 1 in every 87,277 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.