Arnaldo is a distinctive boys' name in United States, ranking #5756 in 2010 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 2010, approximately 1 in every 127,894 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.