Louis vs Lou

Side-by-side comparison of Louis and Lou — popularity rank, total births, peak decade, and historical trends from Social Security Administration data.

Name A

Louis

Boy name · Rank #236

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Name B

Lou

Girl name · Rank #2524

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Which name is more popular?

Metric Louis Lou
Current Rank #236 #2524
Total Births (all years) 405,059 34,043
Peak Year 1921 1954
Peak Year Births 7,247 1,495
Peak Decade 1920ss 1950ss
Gender Boy Girl
First Recorded Year 1880 1880

Births by Decade

Decade Louis Lou
1880ss 8,275 1,364
1890ss 8,442 1,283
1900ss 10,372 1,261
1910ss 50,600 2,550
1920ss 67,693 3,930
1930ss 47,754 5,165
1940ss 49,429 4,722
1950ss 47,931 9,084
1960ss 33,378 3,037
1970ss 20,147 767
1980ss 17,355 177
1990ss 14,435 65
2000ss 10,261 85
2010ss 11,813 255
2020ss 7,174 298

Recent Annual Births (2014–present)

Year Louis Lou
2014 1,229 22
2015 1,210 29
2016 1,242 35
2017 1,302 30
2018 1,387 39
2019 1,475 40
2020 1,334 43
2021 1,418 54
2022 1,442 62
2023 1,477 69
2024 1,503 70

Data Sources

Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications — National Data, ssa.gov/oact/babynames.
Source: SSA Annual Name Rankings, 1880–2024.

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