Canon, JK-approved facts

Name: Gilderoy Lockhart

Name meaning: "Gilderoy" was also the name of a famous highwayman of ballad fame who was reputedly handsome.
"Lockhart" is an Austrailan town near Wagga Wagga. "Wagga Wagga Werewolf" come to mind? Thanks again to Kate C. (There's also a Lockhart, Texas!) Another odd parallel that I came up with was to John Gibson Lockhart, a Scottish lawyer and writer, most famous for the authoritative seven-volume biography of his father-in-law, the novelist Sir Walter Scott. Ok, so it's not self-glorifying, but Gilderoy Lockhart had 7 books on the students' reading list (this does not include Magical Me or the Guide to Household Pests).
Also, although I think the "Beecham Sourcebook" is a load of tosh, Schafer has a parallel that's just too hilarious to pass up: "His name suggests that he is like a gilded locket, something pretty to look at but that does not hold much substance." (from What's In A Name)

Name in other languages: Gyllenroy Lockman (Swedish), Zlatoslav Lockhart (Czech), Glitterik Smørhår (Danish)

Title: Gilderoy Lockhart, Order of Merlin, Third Class, Honourary member of the Dark Force Defence League and five times winner of Witch Weekly's Most-Charming-Smile Award.

Sex: Male

Age: Unknown.

Eyes: Forget-me-not blue

Hair: Wavy and blond

Teeth: White

Looks: Extremely good

IQ: Below zero

Occupation: A best-selling author. His titles include
Gilderoy Lockhart's Guide to Household Pests
Break with a Banshee
Gaddind with Ghouls
Holidays with Hags
Travels with Trolls
Voyages with Vampires
Wanderings with Warewolves
Year with the Yeti

Speciality: Memory charms.

Personality: A narcissistic, egoistic liar. Uses other people in his own interests. Coward.

Favourite colour: Lilac

Secret ambitoin: To rid the world of evil and market his own brand of hair-care potions.

Ideal Birthday gift: Harmony between all magic and non-magic peoples. Wouldn't say no to a large bottle of Ogden's Old Firewhisky ^_~