Arnaldo is a distinctive boys' name in United States, ranking #5263 in 2008 with 17 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 41.4%. In 2008, approximately 1 in every 119,997 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.