It's possible you're thinking of a word that includes "na" as part of it. Here are some possibilities:
* "Na" could be a shortened form of "Nana", which means "grandmother".
* "Na" could be a shortened form of "Nā", which is a possessive pronoun meaning "of" or "belonging to". For example, "Nāku" means "mine."
If you can provide more context about where you encountered "Na," I can help you determine the meaning.