Emperor Pedro I of Brazil (King Pedro IV of Portugal) had 16 names: Pedro de Alcântara Francisco Antônio João Carlos Xavier de Paula Miguel Rafael Joaquim José Gonzaga Pascoal Cipriano Serafim.
His full title, as Emperor of Brazil, was: His Imperial Majesty the Lord Dom Pedro, the First, by the Grace of God and Unanimous Acclamation from the People, Constitutional Emperor and Perpetual Defender of Brazil.
His son, Emperor Pedro II, had 15 names: Pedro de Alcântara João Carlos Leopoldo Salvador Bibiano Francisco Xavier de Paula Leocádio Miguel Gabriel Rafael Gonzaga.
His full title, as Emperor of Brazil, was: His Imperial Majesty the Lord Dom Pedro, the Second, by the Grace of God and Unanimous Acclamation from the People, Constitutional Emperor and Perpetual Defender of Brazil.
Emperor Pedro II's eldest daughter and heir was named: Isabel Cristina Leopoldina Augusta Micaela Gabriela Rafaela Gonzaga ("only" 9 names).
Her full title, at the Fall of the Monarchy, in 1889, was: Her Imperial and Royal Highness the Lady Dona Isabel Cristina Leopoldina Augusta Micaela Gabriela Rafaela Gonzaga, Princess Imperial of Brazil, Princess of Orleans, Countess of Eu.
At her death, in 1921, as Head of the Imperial House, her full title was: Her Imperial and Royal Highness the Lady Dona Isabel Cristina Leopoldina Augusta Micaela Gabriela Rafaela Gonzaga, Head of the Brazilian Imperial House, Princess of Brazil, Princess of Orleans-Braganza, Princess of Orleans, Countess of Eu.
Today, the Imperial Family is still carrying on with big names. The current member of the Brazilian Imperial Family, with their full names and titles (I didn't include their orders of chivalry):
1. His Imperial and Royal Highness the Lord Dom Luiz Gastão Maria José Pio Miguel Gabriel Gonzaga, Head of the Brazilian Imperial House, Prince of Brazil, Prince of Orleans-Braganza.
2. His Imperial and Royal Highness the Lord Dom Bertrand Maria José Pio Januário Miguel Gabriel Rafael Gonzaga, Prince Imperial of Brazil, Prince of Orleans-Braganza.
3. His Royal Highness the Lord Dom Antônio João Maria José Jorge Miguel Gabriel Rafael Gonzaga, Prince of Brazil, Prince of Orleans-Braganza.
4. Her Royal Highness the Lady Dona Cristina Maria Isabel, Princess of Brazil, Princess of Orleans-Braganza (she was born as Her Highness Princess Christine Marie Elisabeth of Ligne).
5. His Royal Highness the Lord Dom Rafael Antônio Maria José Francisco Miguel Gabriel Gonzaga, Prince of Brazil, Prince of Orleans-Braganza.
6. Her Royal Highness the Lady Amélia Maria de Fátima Josefa Antônia Micaela Gabriela Rafaela Gonzaga, Princess of Brazil, Princess of Orleans-Braganza.
7. Her Royal Highness the Lady Maria Gabriela Josefa Fernanda Iolanda Micaela Rafaela Gonzaga, Princess of Brazil, Princess of Orleans-Braganza.
8. Her Royal Highness the Lady Dona Isabel Maria Josefa Henriqueta Francisca Micaela Gabriela Rafaela Gonzaga, Princess of Brazil, Princess of Orleans-Braganza.
9. Her Royal Highness the Lady Dona Eleonora Maria Josefa Rosa Filipa Micaela Gabriela Rafaela Gonzaga, Princess of Ligne, Princess d'Épinoy, Princess d'Amblise, Princess of the Holy Roman Empire, Grandee of Spain.
Normally, a Brazilian Prince name have the following caracteristics:
- Antônio: the first name, by which the Prince will be called.
- João: the second name, usually, given after a Saint (in this case, St. John).
- Maria José: after the Virgin Mary and St. Joseph.
- Jorge: after the godfather (in the casa of a Princess, after a the godmother; in Prince Antônio's case, after Archduke Georg of Austria).
- Miguel Gabriel Rafael: all members of the Family have those three names, given after the Archangels.
- Gonzaga: all members of the Family have this name, given after St. Louis.