This is the 4505th most frequent Catalan word.
na
"Na" is a Catalan honorific title for women, similar to "Miss" or "Lady."
'Na' is here used similarly to 'Miss', showing politeness and respect.
La casa on viu Na Joana és molt antiga.
The house where Miss Joana lives is very old.
This usage is consistent in polite reference to women, often used with their first name.
Ahir vaig veure Na Carme al mercat.
Yesterday I saw Miss Carme at the market.
Here, 'na' is used as an honorific, denoting respect for a female individual.