This is the 4143rd most frequent Spanish word.
humberto
"Humberto" is a Spanish given name of Germanic origin, meaning "bright warrior" or "famous fighter."
In this context, 'Humberto' is employed to refer to a particular individual to whom the question was directed.
Le pregunté a Humberto sobre su opinión.
I asked Humberto about his opinion.
In this sentence, 'Humberto' is used as a proper noun referring to a specific person's name.
Humberto es un hombre amable.
Humberto is a kind man.
Here, 'Humberto' is again a proper noun, identifying the author of the book.