Arnaldo is a distinctive boys' name in United States, ranking #8194 in 2014 with 9 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 69.0%. In 2014, approximately 1 in every 213,382 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.