Recorded 1898–2025 · United States
Marylou was most popular in 1942, when 376 American babies were given the name — ranking #673 that year. In 2025 it ranked #8,252, with 28 births. Across 1880–2025 the Social Security Administration has recorded 13,112 people named Marylou.
Marylou first appears in Social Security Administration records in 1898, which makes it about 127 years old as a recorded American name. It has been recorded in 126 of the 128 years since.
The Social Security Administration has recorded 13,112 American births named Marylou between 1880 and 2025. That is recorded US births, not a world population — it counts people issued a Social Security number at birth in the United States. Of those, roughly 7,686 are estimated to be alive today.
28 American babies were named Marylou in 2025, ranking #8,252 that year.
Marylou is holding steady. Across 2021–2025 it averaged 25 births a year, against 23 a year across 2011–2015 — a change of +8% over the decade.
Measured on recorded births. American births overall have fallen since 2007, so most established names lose births over any recent decade — a name can shed births and still hold its rank. Compare the rank above, which is measured against the other names of the same year.
Across the whole record Marylou is a girl’s name — 100.0% of the 13,112 Americans given it were girls and 0.0% were boys. In births since 2016 it is 100% girls and 0% boys.
Counted from every US birth the Social Security Administration recorded under this name, so it reflects use rather than opinion. A name given to fewer than five babies of one sex in a year is withheld at source and is not counted.
Roughly 7,686 Americans named Marylou are alive today — 59% of everyone ever recorded with the name. The median is 69 years old, and half are between 56 and 80.
An estimate, not a count. Recorded births are carried forward through the Social Security Administration’s 2023 period life table, by age and sex. That table describes mortality in one recent year, so it credits the oldest cohorts with today’s survival rather than the harsher rates they actually lived through — the further back a name peaked, the more this will overstate how many remain. It counts people issued a Social Security number at birth, not immigrants who arrived later.
How much more common the name is in each state than across the country as a whole.
See Marylou on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org