Hacker News Reader

In Italian is almost like that: "tu" (familiar) and "voi" (very formal) or "lei" (less formal)

And Russian.

And Czech. And Dutch

And Afrikaans: jy (familiar), u (ever so formal), but u is (or seems to be) falling out of common use.

And in Turkish. "Sen" ve "Siz".

And Spanish, "Tu" vs "Usted" vs "Vos"