Arnoldo is a distinctive boys' name in United States, ranking #4057 in 2025 with 26 recorded births. The name reached its all-time peak in 1997 with 88 births ranking #1295. Since 1996, the popularity has decreased by 67.9%. In 2025, approximately 1 in every 65,695 boys born was named Arnoldo. RISING Recent data shows the name is currently rising.