Nadia, an exotic but accessible Slavic favorite, has a strong run of popularity in the US in the early 2000s, partially thanks to the character on Lost called Nadia but actually named Noor. An earlier inspiration was Romanian gymnast Nadia Comaneci, who won the 1976 Olympics. But it's since slumped down the rankings, and now sits at Number 358, its lowest position since 1996. Nadia is actually a short form of Nadezhda, the name of Lenin's wife, though more Westerners will relate it to the familiar Natalya or Natasha.
Octomom Suleman spells her first name Nadya, as in the Queen Nadya character in Noel Coward's play The Queen was in the Parlour.