Kaj
Every Kaj since 1956 — 515 of them. Popularity, births, and rankings for each year, from official Social Security records.
The story of Kaj
Kaj is rare for boys in the United States, ranked #12,947 in 2025 with 5 babies given the name. It is currently declining compared with a decade ago.
Since 1956, 515 American babies have been named Kaj. Its peak came in 2006, when 20 newborns received the name — the signature sound of the 2000s.
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 Kaj stood among all boys' names in any year, or use the compare tool to plot it against other names.
Kaj year by year
Every year since 2001, and five-year steps back to 1880. Rank is within each sex.
| Year | Boys | Boys rank |
|---|---|---|
| 2025 | 5 | #12,947 |
| 2024 | 15 | #6,033 |
| 2023 | 8 | #9,346 |
| 2022 | 6 | #11,573 |
| 2021 | 10 | #7,862 |
| 2020 | 8 | #9,129 |
| 2019 | 8 | #9,304 |
| 2018 | 17 | #5,423 |
| 2017 | 10 | #7,864 |
| 2016 | 11 | #7,378 |
| 2015 | 15 | #5,870 |
| 2014 | 10 | #7,846 |
| 2013 | 12 | #6,815 |
| 2012 | 16 | #5,601 |
| 2011 | 19 | #4,905 |
| 2010 | 16 | #5,608 |
| 2009 | 20 | #4,839 |
| 2008 | 15 | #5,926 |
| 2007 | 11 | #7,345 |
| 2006 | 20 | #4,601 |
| 2005 | 10 | #7,399 |
| 2004 | 10 | #7,269 |
| 2003 | 14 | #5,410 |
| 2002 | 15 | #5,026 |
| 2001 | 10 | #6,708 |
| 2000 | 15 | #4,915 |
| 1995 | 7 | #7,382 |
| 1990 | 8 | #6,131 |
| 1985 | 6 | #6,161 |
| 1980 | — | — |
| 1975 | 6 | #5,122 |
| 1970 | — | — |
| 1965 | — | — |
| 1960 | — | — |
| 1955 | — | — |
| 1950 | — | — |
| 1945 | — | — |
| 1940 | — | — |
| 1935 | — | — |
| 1930 | — | — |
| 1925 | — | — |
| 1920 | — | — |
| 1915 | — | — |
| 1910 | — | — |
| 1905 | — | — |
| 1900 | — | — |
| 1895 | — | — |
| 1890 | — | — |
| 1885 | — | — |
| 1880 | — | — |
Famous people named Kaj
- Kaj Munk Writer · 1898–1944
- Kaj Franck Designer · 1911–1989
- Kaj Leo Johannesen Politician · b. 1964
Ranked by global fame across Wikipedia editions (Pantheon project, MIT).
Frequently asked questions
How popular is the name Kaj in 2025?
Kaj ranked #12,947 among boys' names in the United States in 2025, with 5 babies given the name, according to Social Security Administration data.
How many people are named Kaj?
515 babies have been named Kaj in the United States since 1956, based on Social Security card applications.
When was the name Kaj most popular?
Kaj peaked in 2006, when 20 newborns received the name.
Is Kaj a boy or girl name?
Kaj is overwhelmingly a boy's name — 100% of babies with the name.
Is the name Kaj rising or falling?
Kaj is declining — less popular now than a decade ago.
Who are famous people named Kaj?
Well-known people named Kaj include Kaj Munk (writer), Kaj Franck (designer), Kaj Leo Johannesen (politician).