This is the 2344th most frequent Portuguese word.
oswaldo
"Oswaldo" is a Portuguese given name, equivalent to "Oswald" in English.
In this sentence, 'Oswaldo' is used as a proper noun and refers to a person's name.
Oswaldo foi à feira comprar frutas frescas.
Oswaldo went to the market to buy fresh fruits.
Here, 'Oswaldo' is again a proper noun, but it's being referenced as the name itself in a general context.
O nome Oswaldo não é muito comum hoje em dia.
The name Oswaldo is not very common nowadays.
'Oswaldo' is used as the name of a person being addressed or referred to.