WHEEZY: Stubby. Always behind or last in processions. Fatter and shorter than the rest.
JUMPY: (voice: Joe Twirp) Excitable. Goosey type. Talks fast. Mixes his words, as "See's aleep in my sled."
BALDY: (voice: Cliff Arquette) Bashful. Floppy ears. Giggles. Twists buttons. Gets red in the face.
—Story outline for October 22, 1934, for Snow White and the Seven Dwarfs^[1]

Unlike prior versions of Snow White and the Seven Dwarfs, Walt Disney wanted each of the seven dwarfs to have a distinct personality so the audience could connect to each one. One play had given the dwarfs the names Blick, Flick, Glick, Snick, Flick, Whick and Quee^[2], but Disney wished for his dwarfs' names to fit their personalities. In the end, Doc, Grumpy, Happy, Sleepy, Bashful, Sneezy, and Dopey were picked out of a pool of many other names and personalities. The dwarfs that were not picked are listed as follows (circa 1934):

Silly
Sappy
Scrappy
Snappy
Snoopy (1)
Goopy
Gloomy
Gaspy
Gatsby
Gabby
Blabby
Flabby
Crabby

JUMPY: He is in constant twitchy fear of being goosed, but is not goosed until the last scene. Whenever he hears a noise behind him, he starts, and his hand automatically protects his fanny. He is als exceedingly ticklish. He is always helping Sleepy finish his sentences or explaining to Snow White just what Sleepy is trying to say. Type of dialog:
Sleepy: As a rolling stone gathers no... (Falls asleep)
Jumpy: (Laugh) Slood old geepy. He means a stolling rone mathers no goss - a goling mone stathers no ross - a molling gone rathers no - oh, dab!
Sleepy: (To Snow White) Now you know.

AWFUL: The most loveable and interesting of the dwarf characterisations. He steals and drinks and is very dirty. The other dwarfs have impressed on him that he is a soul beyond redemption. This fact he never questions. He feels powerless against the evil in him and accepts his damnation cheerfully. He is the perpetual fall guy for the others. He is blamed and punished for everything that goes wrong and, even when punished for somebody else's misdeed, he takes his medicine with a cheerful "I deserve it." He is very clever, a faithful dog absolutely devoted to the other dwarfs, who seem to him far above him. He speaks in short, jerky sentences, like the Practical Pig, but his voice is a bit more chipper and cheerful. There is always understanding between him and the dwarfs' animals. Awful is always afflicted with irresistable urges againt which he is helpless.
—Story draft for Snow White and the Seven Dwarfs, made in November 1935.^[3]

Cranky
Lazy
Dizzy
Dippy (2)
Dumpy
Snurfles
Dirty
Deafy
Daffy (3)
Doleful
Woeful
Wistful
Soulful
Helpful
Awful
Graceful
Tearful
Tubby
Weepy
Wheezy
Sneezy-Wheezy
Sniffy
Puffy
Stuffy
Strutty
Shorty
Shifty
Slutty
Thrifty
Nifty
Neurtsy
Hotsy
Hungry
Hickey

Grumpy and Deafy
Added by LFarookhi
Deafy is a happy sort of fellow - he always tries to make clever remarks, but he misinterprets other people's attitudes toward him. He feels, lots of times, that they are saying something about him, or that they have made some remarks, which they haven't at all - he takes exception to the most ridiculous things. Throughout the picture Deafy and Grumpy are always clashing. Deafy will pick up one word of the conversation in the early part, and whereas the conversation topic might have changed completely, he still sticks to the first thing that he heard, and in this way we hope to get some comical situations out of Deafy.
—Story draft for Snow White and the Seven Dwarfs, made in early 1936.^[3]

Hoppy
Jumpy
Jaunty
Jazzy
Chesty
Busy
Burpy
Baldy
Biggy-Wiggy
Biggo-Ego

Notes

(1) Not to be confused with Snoopy, a character created by Charles Schulz in 1950.
(2) Not to be confused with Dippy Dawg, the original name for Goofy in 1932.
(3) Not to be confused with Daffy Duck, a character created by Tex Avery in 1937.

References

↑ Snow White and the Seven Dwarfs production timeline (DVD feature)
↑ Bob Thomas, "Disney's Art of Animation: From Mickey Mouse to Beauty and the Beast" (Hyperion, New York, 1991) ISBN 1-56282-899-1
↑ ^3.0 ^3.1 Robert D. Field, "The Art of Walt Disney"