Arnaldo is a distinctive boys' name in United States, ranking #6608 in 2011 with 12 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 58.6%. In 2011, approximately 1 in every 158,249 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.