Macarthur is a distinctive boys' name in United States, ranking #9749 in 2005 with 7 recorded births. The name reached its all-time peak in 1997 with 18 births ranking #3826. Since 1996, the popularity has decreased by 36.4%. In 2005, approximately 1 in every 285,307 boys born was named Macarthur. FALLING Recent data shows the name is currently falling.