David and Barbara
David, which means "beloved", has been a popular name since Biblical days when David killed Goliath and then became one of the most famous kings of Israel. From 1948, David was in the SSA's Top 5 list, occupying every spot at some point, until 1989, an astonishing 45 years.
Famous Davids include frontiersman Davy Crockett, and a whole slew of Davids in the arts -- TV personality Letterman, magician Copperfield, musicians Cassidy and Bowie and actors Duchovny ("The X Files") and Schwimmer ("Friends"). David also has some infamous representation in Son of Sam David Berkowitz and cult leader David Koresh.
The other name in the sixth spot, Barbara, is not a name you often hear anymore. This name, meaning "foreigner" or "stranger" was fashionable in the 1930s and '40s, and was second only to Mary back then. However, once 1952 came along, Barbara disappeared as one of the top five names. Former First Lady Barbara Bush and country singer Barbara Mandrell are two famous Barbaras, as are interviewer extradonaire Barbara Walters, and singing sensation Barbra Streisand who dropped the extra "a" from her name to make it more unique.