Francisus in Latin.
He’ll be known as Francis in English and perhaps someday, we’ll witness a Francis II.
A Franciscan pope shut down the Jesuits in the 18th century (they were later revived).
One of the early Jesuit leaders was St. Francis Borgia (a descendant of one of the illegimate children of the Borgia pope, Alexander VI and an ancestor of Catherine of Braganza, Queen of England as the wife of King Charles II--he was a widower with children when he became a Jesuit). Another famous Jesuit was St. Francis Xavier.
But we never refer to the Pope by his Latin name...we didn’t call JP II Ioannes Paulus but in Poland he was Jan Pavel. Francisco isn’t an uncommon name in America. I think it has a more papal ring to it so I’ll stick with Francisco.