Girl: Doña Isabel Federica Paloma Sofia María de las Mercedes
Isabel - Queen Isabel II
Federica - Queen Sofia's mother, Queen Friederike
Paloma - Letizia's mother
Sofia - Queen Sofia
María de las Mercedes - Felipe's grandmother
Boy: Don Juan Pablo Alfonso Felipe de Todos los Santos
Juan - Juan Carlos I & his father
Pablo - Queen Sofia's father, King Pavlos
Alfonso - all the kings, plus it is a common middle name amongst the male royal Spaniards
Felipe - Felipe
de Todos los Santos - most of the grandkids (plus Elena, Cristina & Felipe) have this or some form of Saints in their name
Isabel - Queen Isabel II
Federica - Queen Sofia's mother, Queen Friederike
Paloma - Letizia's mother
Sofia - Queen Sofia
María de las Mercedes - Felipe's grandmother
Boy: Don Juan Pablo Alfonso Felipe de Todos los Santos
Juan - Juan Carlos I & his father
Pablo - Queen Sofia's father, King Pavlos
Alfonso - all the kings, plus it is a common middle name amongst the male royal Spaniards
Felipe - Felipe
de Todos los Santos - most of the grandkids (plus Elena, Cristina & Felipe) have this or some form of Saints in their name