Muh-Goff
Rebecca Prescott sherman
Ra-nez-may
You get close to the French pronunciation by juxtaposing the English word "bra" and the sound "ee". "bra-ee". (A phonetic spelling is /bʁɑj/, assuming the font shows up properly)
Kupka is pronounced with an u like in bull. Frantisek is properly written with a little angle on top of the s, which makes it sound like sh in she.
The correct pronunciation of Greatorex is 'Gratt-ricks' not 'grate-a-recks'