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And in most Indian languages.

And French, "tu" (familiar singular) and "vous" (formal singular, or plural).

English used to have "thou", but of course that's long since extinct.

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"

Trivia, "thou" was actually the informal pronoun.

On the other hand in Mexican Spanish, "usted" is fading away. It's curious how different cultures get rid of different options.

"Usted" is alive and well in Argentinian Spanish. Divided by a common language indeed...

Hindi has three - tu, tum and aap. I explained some of this on my Hindi lessons site - http://hindipedia.com/hindi-video-lesson-04-pronouns.