Arnaldo is a distinctive boys' name in United States, ranking #6017 in 2015 with 14 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 51.7%. In 2015, approximately 1 in every 136,876 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.