Recorded 1915–2025 · United States
Marlo was most popular in 1970, when 635 American babies were given the name — ranking #680 that year. In 2025 it ranked #2,175, with 204 births. Across 1880–2025 the Social Security Administration has recorded 10,944 people named Marlo.
Marlo first appears in Social Security Administration records in 1915, which makes it about 110 years old as a recorded American name. It has been recorded in 108 of the 111 years since.
The Social Security Administration has recorded 10,944 American births named Marlo 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 9,970 are estimated to be alive today.
204 American babies were named Marlo in 2025, ranking #2,175 that year.
Marlo is rising. Across 2021–2025 it averaged 202 births a year, against 134 a year across 2011–2015 — a change of +51% 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 Marlo is a unisex name — 66.4% of the 10,944 Americans given it were girls and 33.6% were boys. It changed hands: since 2024 it has gone mainly to girls, having gone mainly to boys before that. In births since 2016 it is 56% girls and 44% 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 9,970 Americans named Marlo are alive today — 91% of everyone ever recorded with the name. The median is 47 years old, and half are between 16 and 56. That is a wide band, the mark of a name in steady use across generations rather than a passing fashion.
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 Marlo on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org