This is the 1355th most frequent Spanish word.
marcelo
"Marcelo" is a proper noun, typically a male given name in Spanish.
Here, 'Marcelo' is used as a proper noun, referring to a specific individual by their name.
Marcelo es una persona muy amable.
Marcelo is a very kind person.
In this sentence, 'Marcelo' still functions as a proper noun. It identifies the person being discussed in relation to their opinion or action.
Me parece que Marcelo tiene razón en ese argumento.
I think Marcelo is right in that argument.
This instance uses 'Marcelo' as a proper noun to indicate a third party in a directive or request form, maintaining its usage as identifying an individual.