What does de Mar mean in English?

"De Mar" is not a standard English word or phrase. It's likely a misspelling or a variation of something else.

To help me understand what you mean, could you please provide more context? For example:

* Where did you see "de Mar"? (e.g., a book, a website, a conversation)

* What was the surrounding text or conversation?

* What language do you think it might be from?

Knowing this information will help me figure out the meaning you're looking for.