This is the 1985th most frequent Spanish word.
álvaro
"Álvaro" is a Spanish male given name, not a dictionary word, often of Germanic origin meaning "guardian" or "protector."
In this sentence, 'Álvaro' is used as a proper noun referring to a specific given name.
Álvaro es un nombre común en España.
Álvaro is a common name in Spain.
Here, 'Álvaro' is the name of the person with whom the conversation took place, indicating it as a proper noun.
Hablé con Álvaro ayer sobre nuestros planes.
I spoke with Álvaro yesterday about our plans.
In this instance, 'Álvaro' serves as part of a title, specifying the person's role together with their name.