Marithe:
* Mar-eeth (The "th" sound is similar to the "th" in "thin")
Francois:
* Frahn-swah (The "s" at the end is silent, and the "a" is pronounced like the "a" in "father")
Girbaud:
* Zheer-bo (The "g" is pronounced like the "j" in "gem", the "au" is pronounced like the "o" in "go")
Putting it together:
* Mar-eeth and Frahn-swah Zheer-bo