This is the 6986th most frequent Portuguese word.
irina
"Irina" is not a standard Portuguese word; it is typically a given name.
This sentence uses 'Irina' as a proper noun referring to people named Irina generically, indicating recognition or acquaintance.
Não conheço nenhuma Irina diferente da que trabalha comigo.
I don't know any Irina other than the one who works with me.
Here, 'Irina' is used as a proper noun referring to a person's name.
Irina é uma excelente professora de dança.
Irina is an excellent dance teacher.
In this sentence, 'Irina' is again a proper noun referring to a specific individual, demonstrating direct communication.