Animagi = Ani-MAGE-eye
Animagus = Ani-MAGE-us
Aragog = AIR-a-gog
Azkaban = AZ-ka-ban
basilisk = BAS-il-isk
Beauxbatons = BO- ba-tons (do not pronunce the x)
bogies = BOW-gees (big g)
Cornelius = cor-NEEL-ee-us
Daedalus Diggle = DEED-a-lus DIG-gle
Dobby = DAUB-ee
Draco Malfoy = DRAY-co MAL-foy
Erised = AIR-i-sed
Errol = AIR-il
Fawkes = Fox or Forks
Ginny = JIN-nee (shortened name of Virginia)
Gryffindor = GRIFF-in-door
Hagrid = HAG-rid or HAY-grid
Hermione = Her-MY-on-nee
knuts = nuts (British) or K'noots (American)
Lucius Malfoy = LOO-cius or LOO-shus MAL-foy
McGonagall = ma-GONE-a-gull
Madam Malkin = Madam MAL-kin
Mirror of Erised = Mirror of AIR-i-sed
Muggles = MUG-els
Neville = NEV-ill
Patronus = Pa-TRONE-us
Penelope = pe-NEL-o-pea
Pomfrey = POM-free
Privet Drive = PRi-vet (short "i")
Quidditch = KWID-itch
Rubeus = Roo-BAY-us
Seamus Finnigan = SHAY-mus FIN-i-gan
Scabbers = SCAB-ers (short a sound)
Sirius Black = SEAR-ee-ous Black
Slytherin = SLiTH-er-in (short i sound) 
Voldemort = VOLE-de-more with a silent t at the end. From the French words: Vol = flight; mort = dead, which would mean this name translates as "Flight of Death"
Whinging = WIN-jing
Name and Word Pronuntiation