Marcielo is a distinctive boys' name in United States, ranking #8018 in 2025 with 10 recorded births. This places Marcielo in the bottom 42% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2025 with 10 births ranking #8018. In 2025, approximately 1 in every 170,808 boys born was named Marcielo. STABLE Recent data shows the name is currently stable.