I found this website through Air1.com. It's really neat. You enter your name and it shows how many people in the U.S. have the same name as you.
Jennifer: 1,424,583 people
Hernandez: 586,953 people
Jennifer Hernandez: 2,735 people
Jennifer is the 21st most popular first name in America!! Crazy. It also said that 99.9% of the people with the name Jennifer are female. What a coincidence! I'm a female!