The top baby names, like the top-selling records or most-watched TV shows or you-name-it, command less and less market share:
"The diversity in U.S. baby names has exploded since the 1950s. Back then, a quarter of all boys and girls got one of the top 10 baby names, according to Laura Wattenberg, author of "The Baby Name Wizard" (Broadway, 2005). In recent times, the top 10 names account for only one tenth of all baby names, Wattenberg writes. Her blog has an interactive tool [screenshot shown] that displays the historical popularity of thousands of names from the 1880s to now."