* Mary: Pronounced like "MAIR-ee"
* Catherine: Pronounced like "KATH-er-in"
* des Granches: This part is a little tricky.
* des: Pronounced like "day"
* Granches: Pronounced like "GRAHN-chez" with a hard "g" sound.
Putting it all together, the pronunciation is:
MAIR-ee KATH-er-in day GRAHN-chez