Perhaps the most obvious charactonym in the series is Malfoy, specifically Draco
. Draco is Latin for dragon, and Malfoy is derived from the French for "bad faith" or "unfaithful". As if being named Draco weren't clear enough, his last name begins with a word that means "bad" in half a dozen languages. Lucius, Draco's father, has a name that means "bright", but is also related to Lucifer. Lucius' wife, Narcissa (née Black), is clearly named after Narcissus or narcissism itself, implying the qualities of self-infatuation and egotism. According to the epilogue in Book Seven, Draco and his wife have a son named Scorpius, which settles in neatly to the family's typical name scheme. Given their surname, it is no surprise that the Malfoys come off as flawed, even evil, monsters.Although less certain than the etymologies of the Malfoy family names, Voldemort's name carries with it intriguing possible interpretations. In several languages, parts or the whole of the name mean "dark wizard" or "evil", with "mort" meaning "death". In French, "volee de mort" means "flight of death". His given name, Tom Marvolo Riddle, has several potential meanings, many of them negative. Marvolo, his middle name (and the name of his grandfather), is likely based on the character from Twelfth Night named Malvolio, a servant who craves power and shuns others for being less "pure" than he is. Malvolio is teased and tortured throughout the play by the other servants in the household, and Malvolio swears at the end of the play that he will have his revenge. This vengeful nature, along with humble beginnings, may be the closest connection to the man who would later take the name Voldemort.
The negative names continue even into the muggle world, particularly with the Dursleys. Although their first names do not have necessarily bad connotations, the last name comes from a town in England that Rowling once visited and hated. (Knowing how universally hated the Dursleys are, Rowling suspects she is not popular in the real-life town of the same name.) Most of the other muggles in the books, which are surprisingly numerous, have generic or neutral names. This lackluster series of names could be due to the fact that most of the muggles play minor roles in the books, or just because one doesn't find many "Dedalus Diggle"s outside of the wizarding world.
Within the wizarding world, there are many younger wizards with carefully-chosen names. Hermione Granger, one of Harry's best friends and later Ron's wife, was given a unique first name that, according to Rowling, was chosen specifically to prevent many young girls from being teased (given the uncommon nature of the name). Hermione comes from several legends and texts, including Shakespeare, and typically refers to a strong female character with relationship issues; in one case, Hermione is believed to have cheated on her husband (like Ron believed she was cheating with Harry in Book Seven) and another Hermione was sought by two men simultaneously (like Hermione Granger was sought by both Viktor Krum and Ron). Granger is another word for farmer, which might be an allusion to Hermione's muggle origins.
Harry's other best friend, Ron Weasley, has a more direct purpose behind his first name. Ronald comes from root words meaning "advisor to the leader", which is often Ron's role in the books. He supports Harry in nearly every case, and though his advice is not always cool-headed, he tries his best to stand by Harry and help him through the various challenges they meet in and out of school. According to Rowling, the last name Weasley, a clear reference to a weasel, was chosen specifically because Rowling had always had a fascination with the creatures and felt they were maligned. She connects this misperception with the assumption that redheads are somehow unlucky or bad in some way, a sentiment with which she also disagrees.
Rowling's choices for other members of the Weasley family often include Arthurian legend; indeed, Arthur, the head of the family, is named after King Arthur. Ginny, whose full name is Ginevra, is named after Guinevere and Percy, full name Percival, is named after a knight of the round table. Fred, George, Bill, Charlie, and Molly (a Weasley by marriage) have common English names with less glamorous histories, though many famous figures from the past share these names.
As generic as some of the Weasley names are, they are bizarre compared to Rowling's plain choice for her protagonist. Harry James Potter, the titular character of the series, has very little history attached to his name (at least, specifically). Harry comes from the name Henry, whose root means "ruler of the home". James comes from the name Jacob, a character in the Bible who is the second born of twins and whose name means "holds the heel". Potter, a common English surname, was likely chosen because of its generic nature and possibly as an homage to Beatrix Potter, the famed author. Compared to Harry's friends' names, which are steeped in history, Harry's is simply plain.
The names of Harry's teachers at Hogwarts tend to be far more interesting than Harry's own. Minerva McGonagall, for example, is named after the Roman goddess of wisdom (many of Rowling's choices for names are inspired by or directly taken from Greek and Roman legends, as well as constellations). Alastor Moody, in addition to being often moody, displays the qualities noted by the history of his given name: Alastor means "defender of mankind" or "avenger". Aurora Sinastra, the astronomy teacher, has both a first and last name dealing with stars and their movement. Septima Vector, Hermione's arithmancy teacher, is defined by his subject as well; arithmancy is essentially numerology, and Septima contains the prefix meaning "seven", while Vector is a mathematical term. Charity Burbage, the muggle studies teacher, is constantly advocating for equality and fair treatment of muggles (which, some would argue, is quite charitable of her).
Possibly the most obvious teacher name is that of Remus Lupin, Harry's third year Defense Against the Dark Arts professor. Remus is the name of one of the two wolf brothers that founded Rome. Lupin comes from the root word meaning moon. Even though the plain meaning of the name is never addressed in the books, Hermione eventually discovered Lupin's identity as a werewolf; one can only hope she at least got an inkling of an idea from his name. The only other prominent werewolf in the series, Fenrir Greyback, likely gets his first name from Fenrisulfr, a large wolf in Norse mythology.
Like Fenrir, several "bad guys" in the books have pointed charactonyms. Dolores Umbridge, for example, is hit twice with negative connotations: "dolor" means "pain" and the English word "umbrage" means "insult". Severus Snape, who is one of Harry's worst enemies for the bulk of the series, gets his first name from the Latin word for "stern" or "severe". "Snape", a verb in English, means "to rebuke or be hard upon". Given Snape's frequently harsh and overly-strict treatment of Harry throughout Harry's time at Hogwarts, these names seem appropriate.
There is one bumbling teacher, however, who also deserves mentioning. Gilderoy Lockhart, Harry;s second year Defense Against the Dark Arts teacher, gets his first name from the word for "gilded", or covered in gold. This term is often used to refer to a worthless item that has been covered in a layer of gold to make it appear more valuable; considering Lockhart's sole skill, that of bewitching wizards to steal their memories and claim their adventures, he does seem to be "gilded" in a manner of speaking.
In addition to this vast list of characters, several objects or concepts were clearly named in a deliberate fashion. The term horcrux, meaning an object into which a wizard has placed a piece of his soul, seems to have its origins in two French words meaning "outside" and "essence". Hogwarts, the name of Harry's school, is said to come from a plant called "hogwart" that Rowling saw, though it is also possibly from the movie The Labyrinth, when David Bowie's character mistakenly calls his goblin servant Hoggle by the name of "Hogwart". The four houses in Hogwarts are obviously named, with the snake-related house being called Slytherin and the raven-related house being called Ravenclaw. Perhaps even less creatively named, Diagon Alley just simply a split of the word "diagonally", though pronounced differently.
In addition to houses and objects, many spells in the series are permutations of Latin or obscure English words. Spells like "obliviate" for memory removal, "aguamenti" for producing water, and "expelliarmus" for disarming an opponent all come from clear English or romance language
origins (oblivion, agua, and expel arms). Others, like "wingardium leviosa", are dolled-up versions of English words, in this case "wing" and "levitate". The summoning charm "accio" is from the Latin for "I summon". More than half of all the known spells in the series come from Latin roots. The most-feared killing curse, "avada kedavra", gets its origins as the original pronunciation of the "real world" spell abracadabra. Rowling says that her research noted it meant "let the thing be destroyed", which, for the killing curse, means the casting wizard's opponent.Like the bulk of the of spells, many of these terms get their names from English and Latin origins, although there are a considerable number with different histories. Several constellations and celestial bodies are turned into names (Sirius, the dog star, for one), and Roman and Greek figures are transmuted into teachers and parents. Though some names take their origins from mundane sources (Granger), others have more obscure and interesting histories (Voldemort). Despite the wide range in backgrounds and etymologies for the names and terms used in the Harry Potter series, J.K. Rowling clearly took a great deal of time to add depth and dimension to the characters that she (and we) have loved so well.
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[Many thanks to harrypotter.wikia.com for being so incredibly nerdy and exacting.]

