Macarthur is a distinctive boys' name in United States, ranking #11489 in 2025 with 6 recorded births. This places Macarthur in the bottom 18% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1997 with 18 births ranking #3826. Since 1996, the popularity has decreased by 45.5%. In 2025, approximately 1 in every 284,679 boys born was named Macarthur. FALLING Recent data shows the name is currently falling.