On August 4, 1903, Cardinal Giuseppe Sarto became the 257th Pope of the Catholic Church.
Later that day, Mr. and Mrs. Arthur S. Picking of Bloomfield, New Jersey welcomed a baby boy. Despite being Episcopalians, they named their baby Arthur Sarto Picking.
Young Arthur Sarto was “[p]robably the first child in the country to be named in honor of Pope Pius X,” according to the New York Times.
Source: “Baby Named for Pope.” New York Times 6 Aug. 1903.