I don't usually post on here, but I've just tallied the top tens (thus far) and the results are interesting.
4x Edmund, George, Lewis, Isaac
3x Alexander, Ezra, Felix, Frederick, Luke, Malcolm, Max, Samuel, Sebastian, Tobias
2x Aaron, Aiden, August, Benedict, Boaz, Gideon, Henri/Henry, Henry, James, Jasper, John, Jules, Laszlo, Malachi, Oliver, Oscar, Quentin, Raphael, Remy, Richard, Rupert, Seth, Tennyson, Thomas, Walter, Wesley, William
4x Helena, Lydia, Rose, Sylvie
3x Alice, Genevieve, Melody, Miriam/Mirjam, Virginia
2x Annabeth, Beatrice, Belle, Catherine/Katharine, Eleanor, Elizabeth/Elisabeth, Eulalie, Hazel, Hermione, Julia, Kira, Liliana, Maelle, Meredith, Penelope, Rosaline, Rosemary, Saskia, Susanna, Xanthe