This is the 966th most frequent Portuguese word.
flávio
"Flávio" is a Portuguese male given name, equivalent to "Flavian" in English, derived from the Roman family name Flavius, meaning "golden" or "blond."
In this sentence, 'Flávio' is used as a proper noun referring to a specific personal name.
Flávio é um nome comum no Brasil.
Flávio is a common name in Brazil.
In this context, 'Flávio' is again used as a proper noun, representing a specific person used as an example in the situation mentioned.
Eles citaram Flávio como exemplo na reunião.
They cited Flávio as an example in the meeting.
Here, 'flavios' is used as a noun referring collectively to individuals named 'Flávio' in a general context.