Arnaldo is a distinctive boys' name in United States, ranking #3303 in 2000 with 25 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 13.8%. In 2000, approximately 1 in every 78,557 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.