Answer:
Doctor- completed his medical course in Spain and was conferred the degree of Licentiate in Medicine by the Universidad Central de Madrid
Jose- was chosen by his mother who was a devotee of the Christian saint San
Jose (St. Joseph)
Protacio- from Gervacio P. which come from a Christian calendar
Mercado- adopted in 1731 by Domigo Lamco (the paternal great-great grandfather of Jose Rizal) which the Spanish term mercado means 'market' in English
Rizal from the word 'Ricial' in Spanish means a field where wheat, cut while still green, sprouts again
Alonzo- an old surname of his mother
Y- and
Realonda- it was used by Doña Teodora from the surname of her godmother based on the culture by that time