Arnaldo is a distinctive boys' name in United States, ranking #12182 in 2025 with 5 recorded births. The name reached its all-time peak in 2001 with 35 births ranking #2683. Since 1996, the popularity has decreased by 82.8%. In 2025, approximately 1 in every 341,615 boys born was named Arnaldo. FALLING Recent data shows the name is currently falling.