Wizards, Witches and Beings: G
Gamp
Presumably the creator of Gamp's Law of Elemental Transfiguration of which there are five exceptions, one of those being that food cannot be produced out of thin air. (DH15, DH29)
Gamp, Hesper
Wife of Sirius Black (1877-1952), the oldest son of Phineas Nigellus Black (BFT).
Gaunt family
The last descendents of Salazar Slytherin; Merope was Tom Marvolo Riddle's mother.
Gibbon 
(d. 1997)
Death Eater who set off the Dark Mark during the Battle of the Tower. He was hit by a Killing Curse that had missed Lupin (HBP29).
Godelot
One-time possessor of the Elder Wand. Died in his cellar after his son, Hereward, took the wand from him. (DH21)
Goldstein, Anthony
(b. circa 1980)
Ravenclaw, 1991 - 1998; Prefect 1995 - 1998
A student in Harry’s year (OP10) who became a member of the D.A. (OP16). Anthony fought in the Battle of Hogwarts (DH29 ff.).
Golpalott 
Presumably the creator of Golpalott's Third Law, a lesson Slughorn teaches in Potions: "the antidote for a blended poison will be equal to more than the sum of the antidotes for each of the separate components." (HBP18).
Gorgovitch, Dragomir 
Chaser, transferred to the Chudley Cannons c. 1995. Record holder for most Quaffle drops in a season (DH7).
Ron borrowed Gorgovitch's first name as an alias ('Dragomir Despard') when he, Harry and Hermione broke into Gringotts (DH26).
Dragomir=Slavic name meaning "precious and peaceful." It has nothing to do with dragons, though it sounds like it should.
Goshawk, Miranda 
(b. 1921)
Author of Standard Book of Spells series of books (Standard Book of Spells Grade One, etc.) which are required textbooks for students at Hogwarts (PS5, PA4, GF10, OP9, HBP9).
goshawk = Old English for a large, short-winged hawk once used in falconry.
Miranda = Latin for worthy of wonder. Also the name of the daughter of Prospero
the magician in Shakespeare's "The Tempest".
Goyle
A large, somewhat oafish Death Eater who stood with another similar man named Crabbe at Voldemort's rebirthing party (GF33). He is the father of Gregory Goyle (OP26).
Goyle,
Gregory 
(b. circa 1980)
Slytherin, 1991 - 1998 (PS7), Quidditch
team Beater 1995 - 1998
Thuggish friend of Draco Malfoy. (More...)
Goyle = from "gargoyle" stone demons carved into the exterior of Gothic buildings as rain spouts.
Grandad (Neville's)
Neville can see Thestrals because he saw his grandfather die (OP21). This person may have been Augusta's husband, or his grandfather on Neville's mother's side.
Granger, Hermione
Jean 
(b. September 19, 1979)
Gryffindor 1991 - 1998 (PS7)
Resourceful, principled and brilliant, Hermione was easily the brightest witch of her generation. She, along with Ron Weasley, was one of Harry Potter’s closest friends. She was also Muggle-born (her parents were dentists), and so was a living, breathing example of the fallacy of pureblood wizard supremacy. (More...)
Graves,
Merton 
(b. 1978)
Plays cello with the popular wizarding band The Weird Sisters (fw99).
Greengrass, Astoria (also given as Asteria)
(b. circa 1982)
Astoria is the younger sister of Daphne. She entered Hogwarts two years after her sister and eventually married Draco Malfoy. Their only child was named Scorpius Hyperion Malfoy.
The spelling of Astoria/Asteria's name is in question because it was given as Astoria by Time Magazine, and as Asteria in the hand-drawn family tree shown in the ITV documentary and on Jo's website. Jo also pronounces it Astoria.
Greengrass, Daphne
(b. circa 1980)
Slytherin? 1991-1998
Daphne took her OWLs at the same time as Hermione (OP31). Her younger sister
Astoria grew up to marry Draco Malfoy.
According to an early list of Harry's classmates that Rowling displayed during an interview (HPM), Daphne's name may originally have been Queenie Greengrass. If so (and this document can't really be considered canon), she is a Slytherin student from a pure-blood family (HPM).
Gregorovitch 
(d. September 1997)
European wand maker who made Krum's wand (GF18) and retired from business in the late 1980s (DH8). At one time he owned the Elder Wand and bragged about it, but Gindelwald stole it from him in the early 1940s. When Voldemort was tracking the Wand in 1997, he looked for Gregorovitch. The wandmaker no longer lived at the same address, and Voldemort murdered the woman and children living there out of spite; this may have been Gregorovitch’s family (DH12). When Voldemort finally tracked Gregorovitch down, he tortured him, entered his mind to see that the Wand had in fact been stolen by a fair-haired, merry thief, then killed the wandmaker (DH14). Gregorovitch was a heavy-set man with white beard and hair.
Gregory the Smarmy 
Gregory was a medieval wizard who invented Gregory's Unctuous Unction, a potion that made a person drinking it think whoever gave it to them was their best friend. Gregory appears on Famous Wizard card number 9 (CS/g). There is a secret passage at Hogwarts located behind a statue of Gregory the Smarmy; Fred and George found it during in their first week (PS9).
"Smarmy" = English for "revealing or marked by a smug, ingratiating, or false earnestness" (Merriam-Webster dictionary)
Grey Lady, the
A tall, beautiful but somewhat haughty-looking ghost, the ghost of Ravenclaw tower. Her real name was Helena Ravenclaw and she was the daughter of one of the Founders of Hogwarts (PS12, DH31). (More...)
Greyback,
Fenrir 
Werewolf and low-level Death Eater. (More...)
Fenrir comes from 'Fenriswolf,' 'Fenrisulv,' 'Fenrisulf' the gigantic wolf of the God Loki in Scandinavian mythology.
Griffiths,
Glynnis
Seeker for the Holyhead Harpies in 1953 (QA).
Griffiths, Wilda
Outstanding Chaser who was lured away from the Harpies to Puddlemere United with a 1000 Galleon fee, much to the chagrin of Gwenog Jones, the amazingly talented but dangerous Captain of the Harpies. Gwenog was heard to mention in passing that Griffiths “deserved to be gnawed to death by a starving tarantula,” but the fact that Griffiths disappeared from her broom the following week during a match between Puddlemere United and the Harpies was a mere coincidence (DP1, 2, 3).
Grimstone, Elias
Broommaker from Portsmouth who crafted the Oakshaft 79 in 1879 (QA9).
Grindelwald,
Gellert 
(b. circa 1883 - 1998)
The dark wizard that Dumbledore defeated in 1945 (PS6, PS13). (More...)
'Grindelwald' is a small village in Switzerland; Rowling pronounces Grindelwald's name “GRIN dell vald” (TLC). The name could also refer to Grendel, the troll-like monster of the Anglo-Saxon epic Beowulf.
Grubbly-Plank, Professor
Wilhemina 
An elderly witch with closely cropped gray hair and a very prominent chin; she was the substitute teacher who covered for Hagrid when he was indisposed after Christmas break (January, 1995) and again when he was off negotiating with the giants (OP11); Grubbly-Plank knew a lot about unicorns and seemed to Lavender Brown and others of Harry's year like a particularly good teacher compared to Hagrid, who devoted most their class time looking after Skrewts (GF24).
Grubbly-Plank covered classes for Hagrid at the beginning of the 1995-6 school year and also took the first years across the lake (OP11). Grubbly-Plank smokes a pipe. When Hagrid wasn't available, she nursed Hedwig back to health after she was attacked delivering mail to Harry (OP17).
"grubby looking wizard"
This person was thrown out of the Three Broomsticks by Madam Rosmerta while she was under the influence of Draco Malfoy's Imperius Curse (HBP25).
Grunnion,
Alberic
(1803 - 1882)
Famous wizard, face on a Chocolate Frog trading card (PS6). Alberic Grunnion was the inventor of the Dungbomb (fw61, PS6).
Could possibly be in recognition of 'Alberich,' a powerful wizard from "Song of the Nibelungen." The poem is mythical, but was the basis for Wagner's Ring Cycle. In Wagner's version, Alberich makes a ring from gold that he has found and places a curse on it against its thief! Interestingly, one of the prizes given to a 'hero' of the Ring Cycle is an Invisibility Cloak. --Adrian Allum
Gryffindor,
Godric
(c.1000 A.D.)
One of the four founders of Hogwarts. Gryffindor was featured as the Wizard of the Month for July 2007 on JK Rowling's website (JKR). (More...)
"guard, Platform Nine and Three Quarters"
A wizened old guard sits by the ticket barrier that marks the magical entrance to the platform to ensure that too many people don't go through it at once and frighten the Muggles on the other side (PS17).
Gudgeon, Davy
(b. circa 1960)
Hogwarts student c. 1970s
Foolhardy student who once tried to get past the Whomping
Willow, nearly losing an eye (PA10).
"Gudgeon" = from Latin 'gobion,' variant of 'gobius,' = from Middle English 'gudyon' via Old French 'goujon') something used as bait; a gullible person.
Gudgeon, Galvin
Galvin Gudgeon is the hapless Seeker for the Chudley Cannons. Manager Ragmar Dorkins implored fans not to curse him during the match, since "turning him into a toad will not help his game." Gudgeon did miss several excellent opportunities during a match with the Appleby Arrows when the Snitch twice bounced off his nose. In a match with the Tornados, Gudgeon fell off his broom while trying to catch a passing bumble-bee (DP).
"Gudgeon" = from Latin 'gobion,' variant of 'gobius,' = from Middle English 'gudyon' via Old French 'goujon') something used as bait; a gullible person.
Gudgeon, Gladys
Writes weekly fan mail to Lockhart (CS7, OP23).
"Gudgeon" = from Latin 'gobion,' variant of 'gobius,' = from Middle English 'gudyon' via Old French 'goujon') something used as bait; a gullible person.
Guffy, Elladora
Next door neighbour to Ethelbart Mordaunt. Madam Guffy is fond of practical jokes and has been known on occasion to enchant Mordaunt's garden furniture. This infuriates Mr. Mordaunt, which he once expressed to the Daily Prophet in a letter (DP1).
Gulch, Zamira
Author of Practical Household Magic, who also writes for the Daily Prophet advice column (DP3).
The name comes from 'Elmira Gulch,' the name of the Kansas alter-ego of the Wicked Witch of the West in the film version of The Wizard of Oz.
Gumboil, Alastor
Employee in the Department of Magical Law Enforcement, to whom applicants for "Hit Wizard" positions need to apply. He is in Room 919 (DP).
Gunhilda, see Kneen, Gunhilda
Gunhilda of Gorsemoor
(1556 - 1639)
One-eyed, hump-backed witch who is known for developing a cure for Dragon Pox (fw/37). A statue of Gunhilda stands in the corridors of Hogwarts; a secret passageway leading to Honeydukes' in Hogsmeade opens with a door in her hump (PA10).
Gwenog
(c. 1000s)
Visited with Gertie Keddle, had a cup of nettle tea, and asked Gertie to come out and watch the game going on in the marsh. When Gwenog mentioned that she played the game herself, Gertie went home in disgust (QA3).
