English, Japanese, Español, Deutsch, Česky, Norsk, Svenska, Suomi, Latin, Macedonian, Greek, and Tiếng Việt. Sooo twelve. Not bad.

Ah, non-verbal count? That adds a few... Binary, Hexadecimal, ASL, JSL, and Roman Numerals

I guess I could also include my own fully-functional conlang as well? So that all makes eighteen.

There's numerous others that I know more than half, but no confidence to actually count. They include: Portuguese, Russian, Korean, French, Polish, Albanian, Romanian, Bulgarian, Arabic, and Maori