Arnoldo is a distinctive boys' name in United States, ranking #2329 in 2008 with 56 recorded births. The name reached its all-time peak in 1997 with 88 births ranking #1295. Since 1996, the popularity has decreased by 30.9%. In 2008, approximately 1 in every 36,428 boys born was named Arnoldo. RISING Recent data shows the name is currently rising.