Lou Boy & girl
How popular is Lou?
#1,919 boy name in 2025
81 baby boys were named Lou in the US in 2025, making it the 1919th most popular boy name. Another 65 girls got the name (#2,645 for girls).
18,611living people named Lou (est.)
71median age of people named Lou
38,198babies named Lou since 1880
1 in 22,708US babies born in 2025
Lou popularity over time
Boys Girls
| Rank in 2025 | #1,919 for boys (▲ 201 from 2024) |
|---|---|
| Babies in 2025 | 81 boys, 65 girls |
| 10-year trend | Rising fast (+113% babies vs 2015) |
| Earlier ranks | #3,021 in 2015, #2,322 in 2020 |
| Peak year | 2025 (81 boys) |
| Highest rank | #442 in 1881 |
| First recorded | 1880 |
| Boys vs girls (last 10 years) | 53% boys, 47% girls |
| Chance a classmate shares it | 0.1% in a class of 25 kids born in 2025 |
Where Lou is most popular
Babies named Lou per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFL
- New York: 0.1 per 1,000 (33 boys)
- Iowa: 0.1 per 1,000 (5 boys)
- California: 0.1 per 1,000 (47 boys)
- Minnesota: 0.0 per 1,000 (5 boys)
- Colorado: 0.0 per 1,000 (5 boys)
Lou by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1880s | 119 | #442 |
| 1890s | 103 | #548 |
| 1900s | 84 | #666 |
| 1910s | 271 | #707 |
| 1920s | 352 | #1,041 |
| 1930s | 333 | #904 |
| 1940s | 427 | #927 |
| 1950s | 513 | #888 |
| 1960s | 413 | #943 |
| 1970s | 259 | #1,313 |
| 1980s | 167 | #2,213 |
| 1990s | 161 | #2,689 |
| 2000s | 159 | #3,968 |
| 2010s | 308 | #2,688 |
| 2020s | 420 | #1,919 |
Boy names about as popular as Lou
Questions
- Is Lou a boy or girl name?
- Lou is used for both. Over the last 10 years, 53% of babies named Lou were boys and 47% were girls.
- How popular is the name Lou?
- 81 baby boys were named Lou in the US in 2025, making it the 1919th most popular boy name. Another 65 girls got the name (#2,645 for girls).
- When was Lou most popular?
- Lou peaked in 2025, when 81 boys were given the name. Its highest rank was #442 in 1881.
- How many people are named Lou?
- 38,198 babies have been named Lou in the US since 1880. We estimate about 18,611 of them are alive in 2026, with a median age of 71.
- Where is Lou most popular?
- From 2021 to 2025, Lou was most common in New York, at 0.1 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.