Arnaldo is a distinctive boys' name in United States, ranking #5733 in 2012 with 15 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 48.3%. In 2012, approximately 1 in every 126,442 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.