How many St. Catherine's were there in the world total?

There were multiple saints known as St. Catherine in the world, but the most famous is St. Catherine of Alexandria, a Christian martyr from the 4th century. Other St. Catherines include St. Catherine of Siena, a 14th-century mystic and Doctor of the Church, and St. Catherine Labouré, who had visions of the Virgin Mary in the 19th century.