Baby Names US
boys' name ★ peaked 1927

Cosimo

Gender Boy Rank 2025 #5,654
Rank 2025
#5,654
among boys · ↓550 vs 2024
Babies in 2025
16
named Cosimo
How common
1 in 106,755
boys born in 2025
Peak year
1927
30 babies
All-time total
1,016
#5,093 all-time among boys
First recorded
1911
in Social Security records

Cosimo popularity over time

1,016 babies have been named Cosimo since 1911, 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
0.010.020.020.0318801900192019401960198020002020Peak 1927Boys

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 Boys Per year Change Best rank
1880s – – – –
1890s – – – –
1900s – – – –
1910s 123 12 – #1,541
1920s 218 22 +77% #1,354
1930s 91 9 -58% #1,567
1940s 92 9 +1% #2,009
1950s 70 7 -24% #2,614
1960s 62 6 -11% #2,500
1970s 40 4 -35% #3,576
1980s 50 5 +25% #3,127
1990s 37 4 -26% #6,314
2000s 68 7 +84% #6,884
2010s 80 8 +18% #5,854
2020s (to 2025) 85 14 +77% #5,104

The story of Cosimo

Cosimo is rare for boys in the United States, ranked #5,654 in 2025 with 16 babies given the name. It is currently rising compared with a decade ago.

Since 1911, 1,016 American babies have been named Cosimo. Its peak came in 1927, when 30 newborns received the name, the signature sound of the 1920s.

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 Cosimo stood among all boys' names in any year, or use the compare tool to plot it against other names.

How old are people named Cosimo?

The median living Cosimo is about 33 years old; half are between 9 and 61. An estimated 500 people named Cosimo are alive in the United States today.

median 33 020406080100

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

Cosimo year by year

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

Year Boys Boys rank
2025 16 #5,654
2024 19 #5,104
2023 18 #5,289
2022 12 #6,907
2021 10 #7,718
2020 10 #7,626
2019 14 #6,162
2018 14 #6,095
2017 15 #5,854
2016 6 #10,999
2015 9 #8,171
2014 5 #12,447
2013 – –
2012 – –
2011 8 #8,917
2010 9 #8,278
2009 12 #6,884
2008 10 #7,801
2007 7 #9,966
2006 6 #10,931
2005 10 #7,217
2004 5 #11,690
2003 7 #8,832
2002 – –
2001 5 #10,895
2000 6 #9,300
1995 5 #9,113
1990 – –
1985 – –
1980 14 #3,127
1975 8 #4,018
1970 8 #3,576
1965 – –
1960 – –
1955 8 #3,015
1950 9 #2,614
1945 8 #2,604
1940 10 #2,357
1935 8 #2,752
1930 22 #1,567
1925 15 #2,109
1920 19 #1,835
1915 17 #1,719
1910 – –
1905 – –
1900 – –
1895 – –
1890 – –
1885 – –
1880 – –

Famous people named Cosimo

The most globally famous bearers of the name, ranked by fame across Wikipedia editions (Pantheon project, MIT).

  1. 1 Cosimo de' Medici Cosimo de' Medici Ruler of Florence from 1434 to 1464 1389–1464 · Medieval
  2. 2 Cosimo I de' Medici, Grand Duke of Tuscany Cosimo I de' Medici, Grand Duke of Tuscany Duke of Florence later Grand Duke of Tuscany (1537–1574) 1519–1574 · 16th century
  3. 3 Cosimo III de' Medici, Grand Duke of Tuscany Cosimo III de' Medici, Grand Duke of Tuscany Grand Duke of Tuscany from 1670 to 1723 1642–1723 · 17th century
  4. 4 Cosimo II de' Medici, Grand Duke of Tuscany Cosimo II de' Medici, Grand Duke of Tuscany Grand Duke of Tuscany from 1609 to 1621 1590–1621 · 16th century
  5. 5 Cosimo Rosselli Cosimo Rosselli Italian painter 1439–1507 · Medieval
  6. 6 Cosimo Tura Cosimo Tura Italian painter (c.1430–1495) Medieval

Portraits from Wikipedia (Wikimedia Commons).

Frequently asked questions

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

How old is the average Cosimo?

The median living Cosimo is about 33 years old. Half of all living Cosimos are between 9 and 61 years old.

How many people named Cosimo are alive today?

An estimated 500 people named Cosimo are alive in the United States, based on 1,016 recorded births and Social Security life tables.

How popular is the name Cosimo in 2025?

Cosimo ranked #5,654 among boys' names in the United States in 2025, with 16 babies given the name, according to Social Security Administration data.

How many people are named Cosimo?

1,016 babies have been named Cosimo in the United States since 1911, based on Social Security card applications.

When was the name Cosimo most popular?

Cosimo peaked in 1927, when 30 newborns received the name.

Is Cosimo a boy or girl name?

Cosimo is overwhelmingly a boy's name: 100% of babies with the name.

Is the name Cosimo rising or falling?

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

Who are famous people named Cosimo?

Well-known people named Cosimo include Cosimo de' Medici (businessperson), Cosimo I de' Medici, Grand Duke of Tuscany (politician), Cosimo III de' Medici, Grand Duke of Tuscany (politician).

Names like Cosimo

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

Compare Cosimo with similar names → More names starting with C →