what are the most common first name and last name initials in the united states?

Since we know that the top 5 most popular first names are: James, John, Robert, Michael, and Mary, this would make the most popular first name initial either "J," or "M." We also know that the top 5 most popular last names are: Smith, Johnson, Williams, Jones, and Brown, this makes the most common last initial a "J." So the most popular initials are likely to be either J.J., or M.J.
Updated on Monday, February 06 2012 at 07:15AM EST
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