Fitzwilliam is a distinctive boys' name in United States, ranking #7815 in 2019 with 10 recorded births. This places Fitzwilliam in the bottom 45% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2017 with 10 births ranking #7762. In 2019, approximately 1 in every 179,336 boys born was named Fitzwilliam. FALLING Recent data shows the name is currently falling.