Pls tell me yall thought of this too...

I was showing my friend who doesn't play twst screenshots of Rook's bday lines and he speaks a bit of French at the end of the last line (as usual yk) and she asks if he's French. I said "I'm not sure I just know he speaks it" but then I realized.. If they couldn't pronounced Yuu's name bc it was of Japanese descent and Japan doesn't exist in Twisted Wonderland .. by that logic France shouldn't either right? ...How is Rook speaking French?