A good Vampire first and last name would be one that is Romanian. This is because vampires originated in Transylvania, a region located in Romania. Vlad III the Impaler, the Prince of Wallachia was the inspiration for Count Dracula. Vlad III fought several battles with the Ottoman Turkish armies before he was eventually captured and killed. He was well-known for impaling any person he captured. There were also rumours that Vlad and his army drank the blood of captured soldiers. This is where the legend of the vampire came from.
Some Romanian names that sound villainous for males are: Dragos Dragomir; Lucian Kinczllers; Dorin Mondragon; Grigore Carp; and Decebal Cornea. Some examples of vicious female names are: Narcisa Stinga; Ionela Vladu; Anca Steala; Viorica Tere; and Domnica Tirea. If you are interested in more familiar names, you might consider for a male: Xavier Dragoon; Damien Dagger; Dorian Powers; Lucifer Mystic; and Hades Dracul. Some female names include: Cruella Diablo; Persephone Deathknight; Violencia Terror; Terra Grimm; and Vanity Bloodtear. You could try making your names comical. Some examples are Angelica Fangs, Darlene Divine and Vampire Jim-Bob. The type of name you choose for your vampire would depend on what type of vampire you want to have.
If you want more ideas for vampire names, try watching movies or television shows about vampires. True Blood and Vampire Diaries are some television shows. You could even try watching historical documentaries about vampires for inspiration. 30 Days of Night, Priest, Underworld, and Twilight are examples of vampire flicks. There are good examples in vampire literature such as: Anita Blake: Vampire Hunter; Bloodlines; The Vampire Chronicles; The Morganville Vampires series; and Carmilla. Vampire history is very interesting to read and learn about. If you are able to research it, you may be able to come up with good vampire names on your own.