Arnaldo is a distinctive boys' name in United States, ranking #3197 in 1998 with 24 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 17.2%. In 1998, approximately 1 in every 79,638 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.