Felipe Juan Pablo Alfonso de Todos los Santos de Borbón y de Grecia
He was baptised with the names of Felipe, Juan, Pablo and Alfonso de Todos los Santos in memory, respectively, of the first Bourbon King to reign in Spain, of the Head of the Spanish Royal Household, his paternal grandfather, of the King of Greece, his maternal grandfather, and of the former King of Spain, his great-grandfather Alfonso XIII. De Todos los Santos means All Saints. That's aditional names - Bourbon tradition.
Some theories
http://ca.answers.yahoo.com/question...1025643AAOnCS9
Present
de Todos los Santos in Spanish Borbons:
childrens of Cristina Federica Victoria Antonia de los Silos de Borbón y de Grecia
Felipe Juan Froilan de Todos los Santos de Marichalar y de Borbon
Victoria Federica de Todos los Santos
Cristina Federica Antonia de la Santisima Trinidad (Holy Trinity) de Borbon y de Grecia
Juan Valentín de Todos los Santos Urdangarín y de Borbón
Miguel de Todos los Santos
Irene de Todos los Santos
Felipe Juan Pablo Alfonso de Todos los Santos de Borbon y de Grecia
Leonor de Todos los Santos de Borbon y Ortiz
Maria del
Pilar Alfonsa Juana Victoria Luisa Ignacia de Todos los Santos de Borbon y Borbon-Dos Sicilias
Margarita Maria de la Victoria Esperanza Jacoba Felicidad Perpetua de Todos los Santos