Several people include original characters in their stories, but some of the names are not very believeable (to both the readers and the author) and may require help in finding the right names for their characters. This is where I'd like to help...

It'd be an understatement for me to say that I like naming Potterverse characters. I love making them, and I'd like to share that with other SS members who are having trouble finding names. Here are a list of names I've created for my own fic, that will give you an idea of names I think would fit nicely in the Potterverse (granted these are American wizard names, but I think they'd be very similar):

My Fic:
Patrick Thatcher
William Quinn
Elizabeth Crane
Travis Sweeney
Miranda Pinsley
Gerald Flynn
Benjamin Speckley
Emeritus Thatcher
Jeffrey Flexing
Digory Mediment
Wynona Pistil
Tyler Hewden
Osric Obelus
Eleanor Litmus
Prunella Mott
Patricia Pennipot
Hephaestus Gallows
Andorra Hobbes
Curmudgeon Plumper
Amontus Tidwell
Marcellus Bravura
Edmund Pring
Mittimus Rawling
Edipus Snelling
Geldon Lurgy
Basil Rathbone
Orpheus Staves
Meredith Tuttle
Julius Vexing

Other Members:
Lissydove: The surname in Persephone Tergins
Aingil an Speir: The first name (obviously) in Pyramus Malfoy.

Words to Authors:
Try existing names and change the last name. Look up uncommonly used words in the dictionary that fit your character's personality. Latin searches as well as mythology is also a good choice. Remember, when making a name, remember your character's personality.