Macarthur is a distinctive boys' name in United States, ranking #7393 in 2010 with 11 recorded births. This places Macarthur in the bottom 48% 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. In 2010, approximately 1 in every 174,401 boys born was named Macarthur. FALLING Recent data shows the name is currently falling.