Louisa vs Lou

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

Name A

Louisa

Girl name · Rank #733

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Name B

Lou

Girl name · Rank #2524

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Which name is more popular?

Metric Louisa Lou
Current Rank #733 #2524
Total Births (all years) 21,523 34,043
Peak Year 2021 1954
Peak Year Births 424 1,495
Peak Decade 2010ss 1950ss
Gender Girl Girl
First Recorded Year 1880 1880

Births by Decade

Decade Louisa Lou
1880ss 1,420 1,364
1890ss 1,272 1,283
1900ss 993 1,261
1910ss 1,619 2,550
1920ss 1,765 3,930
1930ss 1,227 5,165
1940ss 1,284 4,722
1950ss 1,442 9,084
1960ss 1,371 3,037
1970ss 1,005 767
1980ss 1,072 177
1990ss 1,084 65
2000ss 1,154 85
2010ss 2,939 255
2020ss 1,876 298

Recent Annual Births (2014–present)

Year Louisa Lou
2014 281 22
2015 303 29
2016 347 35
2017 373 30
2018 386 39
2019 422 40
2020 383 43
2021 424 54
2022 340 62
2023 346 69
2024 383 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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