No Rod, there is no word for familiarity arising from the word tu (I think that is what you mean). There are other words for familiarity.

>I find it interesting that a wide range of languages have this trait of using the 2nd person plural as the polite form of the third person singular.
Indian languages also have third person plural used as a polite form for third person singular. Does that happen in French too?

> When and how did English lose the 2nd person singular?
I thought thee thou was dropped because it was thought too polite?