Baby Names US
Unisex name ★ peaked 2025

Lennyn

Gender Unisex · 87% girls Rank 2025 #1,552 Trend ↑ Rising 149%
Rank 2025
#1,552
among girls · ↑248 vs 2024
Babies in 2025
142
named Lennyn · +21% vs 2024
How common
1 in 11,818
girls born in 2025
Peak year
2025
142 babies
All-time total
930
#8,663 all-time among girls
First recorded
2001
in Social Security records

Lennyn popularity over time

930 babies have been named Lennyn since 2001, according to official Social Security records. Switch measure to see births per year or the yearly rank.

Measure
Births per 1,000 babies of that sex, comparable across eras
0.030.050.080.118801900192019401960198020002020GirlsBoys
GirlsBoys

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade Girls Boys Total Per year Change Best rank
1880s – – – – – –
1890s – – – – – –
1900s – – – – – –
1910s – – – – – –
1920s – – – – – –
1930s – – – – – –
1940s – – – – – –
1950s – – – – – –
1960s – – – – – –
1970s – – – – – –
1980s – – – – – –
1990s – – – – – –
2000s 5 47 52 5 – #18,969
2010s 229 48 277 28 +433% #3,427
2020s (to 2025) 575 26 601 100 +262% #1,552

Where Lennyn is heading

A five-year projection from the recent trend in births per 1,000 girls (damped so it flattens over time), converted to babies at today's birth totals. The implied rank places that projection in the 2025 field. A projection, not a promise: real trends bend.

Year Projected babies Per 1,000 girls Implied rank
2026 161 0.10 outside top 500
2027 186 0.12 outside top 500
2028 210 0.13 outside top 500
2029 233 0.14 outside top 500
2030 254 0.16 outside top 500

Where Lennyn is most popular

Girls named Lennyn per 1,000 girls born in each state, 2021–2025. National average: 0.063 per 1,000. Strongest in South Dakota, Iowa, and Wisconsin.

Vs national average
well below below near national above well above no data

All 50 states and DC, sorted by rate. Counts are girls named Lennyn born 2021–2025; the per-1,000 rate makes states of different sizes comparable, and the last column shows each state against the national average.

State Girls 2021–2025 Per 1,000 vs national
South Dakota 18 1.26 +1898%
Iowa 17 0.291 +361%
Wisconsin 20 0.194 +208%
Michigan 33 0.181 +187%
Utah 10 0.120 +90%
Minnesota 12 0.111 +76%
Oklahoma 5 0.068 +8%
Pennsylvania 15 0.063 ≈ national
Ohio 14 0.059 -6%
Kentucky 5 0.058 -7%
Florida 18 0.042 -33%
Missouri 5 0.041 -34%
North Carolina 7 0.031 -51%
Illinois 5 0.022 -65%
New York 7 0.018 -72%
Texas 6 0.007 -88%
California 5 0.006 -91%
Alaska – – –
Alabama – – –
Arkansas – – –
Arizona – – –
Colorado – – –
Connecticut – – –
District of Columbia – – –
Delaware – – –
Georgia – – –
Hawaii – – –
Idaho – – –
Indiana – – –
Kansas – – –
Louisiana – – –
Massachusetts – – –
Maryland – – –
Maine – – –
Mississippi – – –
Montana – – –
North Dakota – – –
Nebraska – – –
New Hampshire – – –
New Jersey – – –
New Mexico – – –
Nevada – – –
Oregon – – –
Rhode Island – – –
South Carolina – – –
Tennessee – – –
Virginia – – –
Vermont – – –
Washington – – –
West Virginia – – –
Wyoming – – –

State counts come from the Social Security Administration's state files, which omit any state-year with fewer than five babies of a name, so small states can undercount slightly.

The story of Lennyn

Lennyn is rare for girls in the United States, ranked #1,552 in 2025 with 136 babies given the name. It is currently rising compared with a decade ago.

Since 2001, 930 American babies have been named Lennyn, about 87% girls and 13% boys, making it a genuinely unisex name. Its peak came in 2025, when 142 newborns received the name, the signature sound of the 2020s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Lennyn stood among all girls' names in any year, or use the compare tool to plot it against other names.

How old are people named Lennyn?

The median living Lennyn is about 4 years old; half are between 1 and 8. An estimated 900 people named Lennyn are alive in the United States today.

median 4 020406080100

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Lennyn year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year Girls Girls rank Boys Boys rank
2025 136 #1,552 6 #11,453
2024 112 #1,800 5 #13,438
2023 93 #2,083 8 #9,422
2022 99 #1,985 – –
2021 72 #2,472 7 #10,357
2020 63 #2,674 – –
2019 46 #3,427 5 #13,328
2018 32 #4,412 7 #10,305
2017 42 #3,669 9 #8,555
2016 46 #3,445 9 #8,550
2015 23 #5,762 – –
2014 18 #6,880 7 #10,292
2013 7 #14,025 – –
2012 8 #12,904 – –
2011 7 #14,187 6 #11,704
2010 – – 5 #13,481
2009 5 #18,969 12 #7,076
2008 – – 10 #8,061
2007 – – 10 #7,945
2006 – – – –
2005 – – – –
2004 – – – –
2003 – – 5 #12,010
2002 – – – –
2001 – – 10 #6,754
2000 – – – –
1995 – – – –
1990 – – – –
1985 – – – –
1980 – – – –
1975 – – – –
1970 – – – –
1965 – – – –
1960 – – – –
1955 – – – –
1950 – – – –
1945 – – – –
1940 – – – –
1935 – – – –
1930 – – – –
1925 – – – –
1920 – – – –
1915 – – – –
1910 – – – –
1905 – – – –
1900 – – – –
1895 – – – –
1890 – – – –
1885 – – – –
1880 – – – –

Frequently asked questions

Quick answers about Lennyn, drawn from the same Social Security data as the charts above.

How old is the average Lennyn?

The median living Lennyn is about 4 years old. Half of all living Lennyns are between 1 and 8 years old.

How many people named Lennyn are alive today?

An estimated 900 people named Lennyn are alive in the United States, based on 930 recorded births and Social Security life tables.

How popular is the name Lennyn in 2025?

Lennyn ranked #1,552 among girls' names in the United States in 2025, with 136 babies given the name, according to Social Security Administration data.

How many people are named Lennyn?

930 babies have been named Lennyn in the United States since 2001, based on Social Security card applications.

When was the name Lennyn most popular?

Lennyn peaked in 2025, when 142 newborns received the name.

Is Lennyn a boy or girl name?

Lennyn is used for both: about 87% of babies named Lennyn have been girls and 13% boys.

Is the name Lennyn rising or falling?

Lennyn is on the rise, noticeably more popular now than a decade ago.

Will Lennyn become more popular?

Lennyn is trending upward. If the recent trend holds, we project roughly 254 girls named Lennyn in 2030, which would rank outside the top 500. Forecasts assume the current trend continues and become less certain further out.

Names like Lennyn

Names that sound and feel close to Lennyn: shared sounds, similar era, similar popularity. Each links to its full history.

Compare Lennyn with similar names → More names starting with L →