What does stasou mean in Greek?

There's no word "stasou" in standard Modern Greek. It's possible:

* It's a misspelling: Could you be thinking of a similar-sounding word? Knowing the context would help.

* It's a dialectal word: Greek has many dialects, and a word might exist in one but not be widely known.

* It's a proper noun: It could be a name or place name.

To help me understand what you mean, please provide more context. Where did you encounter this word?