Xenoblade Chronicles 2 sold 1.31 million copies.

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Rocketjay8 said: 

Looks like Monolith finally has a million-selling game for the Xenoblade series since Xenosaga and Xenogears. I hope that the third game will be even better.

Technically Xenoblade is not the same franchise as Xenosaga and Xenogears.

The first game was a new IP originally titled "Monado: The Beginning of the World" and was only changed to "Xenoblade" at the last minute as a tribute to director Tetsuya Takahashi.