Instructions: Choose the gender you want from the menu below, then click the button underneath to get a random name. Entering a name first is unnecessary.
Basically, this gives names that sound like they might fit into the Harry Potter universe, but sampled mostly from US sources - thus, you can create names for American witches and wizards that sound different from their British counterparts (though there is some crossover). Also, they don't sound too bad on people who live in wacky little Oregonian towns, either.
Also, check these out:
The Chronicles of Peter Potter in Wonderland Name Generator
Tips For Making Better Harry Potter OCs
Ideas To Explore in a Next-Gen/Future Harry Potter Story or Roleplay
Quick Character & OC Creation Kit
Magic Wand Generator
Witch & Wizard Wardrobe Generator
Magical/Quirky Item Maker Mk. 2
Glass Bottle Generator Book Generator
Magic Book Title Generator
Random Teen Generator
Companion Owl Generator
Fantabulous Harry Potter-Ish School & House Name Generator
Magic School Generator