You can tell the RadTrad Catholics. They name their kids after apostles, evangelists, martyrs...
The rest name their kids after rock stars and soap opera characters. Kimberly, Tiffany, Kayla, Kaden...YUCK!
As for girls, I never see any young Lindas, Lynns, Anns or Marys anymore. If you encounter someone with one of those names, she is likely to be a baby boomer, as are men named Ken and Glen.