Hermione Granger - The name Hermione means "eloquence," something that surely does not relate to her personality or character traits. However, her mythological counterpart is Hermione, daughter of Helen and Menelaus. Greek stories about Hermione usually concern her superior intellect and how it makes her disliked at times, something that happens to Hermione Granger often.
Draco Malfoy - Draco's first name is the Latin word for both "dragon" and "serpent." Both of these creatures remind us of Draco's slyness and tendency to "slither" around, committing hateful deeds.
Parvati Patil - Parvati is a Hindu goddess.
Harry Potter - Not a lot of thought seems to have gone into Harry's name, but there are still definite references to his life hidden in it. The name "Harry" is extremely common in Britain, hinting at his pauper status while living with the Dursleys. Furthermore, the surname "Potter" may have relativity to the biblical term "potter's field," a place where unknown persons were buried. J.K. Rowling has said on several occasions that Harry is her favourite name for a boy, and if she had a son that would be his name.
Ginny Weasley - Ginny's first name is a short form of Virginia, which means "chaste" or "virginal." This suggests Ginny's rather sweet and innocent qualities.
Ron Weasley - Popular mythologist Charles Hart did some digging through ancient Scottish folklore and discovered a very interesting bit of information that Rowling may have had in mind when naming Ron. A rather obscure legend says that ancient warlord Running Weasel was an extremely talented chess player (like Ron) and died of an accident involving a rat that had been dyed yellow - something that Ron attempts in Book I. NOTE: The surname "Weasley" does not seem to have any reference to the word "weasel" besides its spelling and similar sound. It does not imply that the Weasley family members look or act like weasels. The connection is only in word and spelling and does not prove any personality connections to the family
Oliver Wood - The last name "Wood" sounds a lot like "wad," which means "crazed" or "mad" - likewise, Oliver is extremely passionate about Quidditch and very eccentric, as well.