Mariusz is a distinctive boys' name in United States, ranking #13615 in 2011 with 5 recorded births. This places Mariusz in the bottom 5% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2005 with 8 births ranking #8808. In 2011, approximately 1 in every 379,798 boys born was named Mariusz. FALLING Recent data shows the name is currently falling.