few things grate me like hearing designers names butchered, like channel or lo-is voo-it-on. there are quite a few designers who do have challenging names but here is a guide to the hardest to pronounce.

balenciaga: ba-lin-cee-ah-ga
bottega veneta: Bo-tega Ven-e-ta
bulgari: Bull-gah-ree
burberry prorsum: Bur-bur-ree Pror-some
christian louboutin: Loo-boo-tin
chanel: Shan-el
givenchy:Jhee-von-shee
hermès: Air-mess
louis vuitton: Loo-ee Voo-ee-ton
moschino:Mo-ski-no
narcisco rodriguez: Nar-siss-co Ro-dree-gez
yohji yamamoto: Yo-jee Ya-ma-mo-to