In the world, Mary-Lou (Mary-Lou 
) is a rare female first name. The first name Mary-Lou is habitual in New Zealand, where it is a rare girly name, Australia, and the United States. In absolute terms, the name is most common in the United States, Australia, and Philippines. Parts of the name also exists independently as a first name Mary, and a last name Lou.
| VARIANT | COUNTRY |
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| Mary-Lou | Australia, France, Canada, Philippines, United States |
| mary-lou sturridge Peerage person ID=644802 |
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| mary-lou pardue American geneticist, US |
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| mary-lou sedney |
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| mary-lou koshman |
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Lee, Hoadley, Walker, Willis, Wilson, Misrahy, Stewart, Smulders, Carlyle, Collins, Coulter, Barratt, Baldwin, Keating, Russell, Jackson, Johnson, Watkins, Wheeler, Mccarthy, Anderson, Campbell, Thomas, Garcia, Rogers, Palmer, King, Owen, Sousa, Scott, Smith, Adams, Brown, Kelly, Price, Davis, Williams, Duffy, Lopez, James, Jones, Foley, White, Martin, Miller, Murphy, Mclean, Seyeau, Lewis, and Mcdonough