Arnaldo is a distinctive boys' name in United States, ranking #4821 in 2007 with 19 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 34.5%. In 2007, approximately 1 in every 109,223 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.