Arnaldo is a distinctive boys' name in United States, ranking #4592 in 2009 with 21 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 27.6%. In 2009, approximately 1 in every 94,443 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.