From the experts:
In ancient Rome, Cornelia was considered the paragon of womanly virtue, making it a handsome name with an excellent pedigree. It's rare today, so if you want a name no one else is using, somewhat reminiscent of Amelia and the Shakespearean Cordelia, Cornelia should be on your list. Cornelia's short forms might include Cora, Nelia or Nell--anything but Corny.
The name of the mother of famous second century Roman reformers, Cornelia emerged in England in the seventeenth century, probably brought in by Dutch immigrants. The painter Jan Vermeer had a daughter named Cornelia.
Cornelia has not made a mark on the U.S. popularity list since 1965--so she's more than due for reconsideration. In the meantime, it's been associated with contemporary socialite Cornelia Guest, giving the name an elite image.