The norm in Latin America (and I think in Spain too) is having 2 first names and 2 last names. People usually uses the first - first name and first last name only, so the second first name (so to speak) is in fact a middle name. Some people, like my father, have 2 first names and an invocation to a Patron Saint, which works as a 3rd first name (Something along the lines of Luis Alberto de la Trinidad Lastname Lastname)
Let's see well-known example: Everybody hs heard of Hugo Chávez. His full name was Hugo Rafael Chávez Frías. "Rafael" being his middle name and "Frías" his mother's last name
I'd bet the 4% percent that got the middle name right tried with "José"