i'm not totally sure about this but it's my 5th year of french so:
Louis Vuitton: Loo-ee Vee-tawn
Hermes: airmez....but you have to get the "air" part like in the back of your throat so it doesn't sound like "air" but...like..uh i dunno i can't really explain it. the "h" is silent because h's just aren't pronounced in french and the accent grave on the e gives it the "ez" sound or else the "es" at the end wouldn't be pronounced (unless the word following started with a vowel or h+vowel)
Louis Vuitton: Loo-ee Vee-tawn
Hermes: airmez....but you have to get the "air" part like in the back of your throat so it doesn't sound like "air" but...like..uh i dunno i can't really explain it. the "h" is silent because h's just aren't pronounced in french and the accent grave on the e gives it the "ez" sound or else the "es" at the end wouldn't be pronounced (unless the word following started with a vowel or h+vowel)