The Social Security Administration has data on baby names going back to 1880. For the first 67 years, Mary was the most popular female baby name in the United States. Linda finally surpassed her in 1947.

Related Fact: For the first 44 years, John was the most popular name for male newborns. The streak was broken in 1924, when Robert took first place.

[Source: Social Security Administration. See previous Numbers of the Day here. ]