Kayjay
A combination of the initials K and J, with no definite meaning.
Name Census estimates that about 5 living Americans carry the first name Kayjay. The name is used almost exclusively for boys. The average person named Kayjay today is around 3 years old, and the year with the single highest number of Kayjay births was 2023 (5 babies).
This page is the full Name Census profile for Kayjay. Below you will find a gender breakdown showing how the name splits between male and female registrations, a year-by-year popularity chart stretching back to 1880, decade-level totals, the top US states for this name, its meaning and etymology, and a set of frequently asked questions with data-backed answers.
For a British comparison, Name Census UK has a UK baby-name profile for Kayjay with official rankings and popularity over time.
Key insights
- • Fewer than 100 living Americans are believed to carry the name Kayjay. It is among the rarest names in the SSA records.
People living today
5
~ 1 in 68,550,868 Americans
Peak year
2023
5 babies that year
Average age
3
years old
2023 SSA rank
#13,213
Tracked since 2023
Popularity
Kayjay: popularity over time
Babies born per year
Decades
Kayjay by decade
The table below breaks the full SSA timeline into ten-year windows. Each row shows how many male and female babies were given the name Kayjay during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
| Decade | Male | Female | Total |
|---|---|---|---|
| 2020s | 5 | 0 | 5 |
Origin
Meaning and history of Kayjay
The name Kayjay is a relatively modern name, believed to have originated in the 20th century as a blend of the names Kay and Jay. It does not have a direct linguistic or cultural origin from ancient times.
While the individual names Kay and Jay have separate histories, the combined form Kayjay is a more recent invention. Kay is a diminutive of the name Katharine or Katherine, which derives from the Greek name Aikaterine. Jay is a diminutive of the name Jacob, which comes from the Hebrew name Ya'aqov.
The earliest recorded examples of the name Kayjay are from the mid-20th century. One of the earliest known individuals with this name was Kayjay Janecka, an American singer and musician born in 1949. Another notable figure was Kayjay Dallimer, an Australian rugby league player active in the 1970s and 1980s.
Kayjay Sukarno was an Indonesian politician and diplomat who served as the ambassador to several countries in the late 20th century. Kayjay Ramasamy was a Malaysian politician and activist who fought for the rights of the Indian community in Malaysia in the 1990s and 2000s.
In the world of sports, Kayjay Hill was an American basketball player who played in the WNBA in the early 2000s. Kayjay Bynum was an American football player who played in the NFL in the 2010s.
As a relatively new name, Kayjay does not have a long historical record or references in ancient texts or religious scriptures. Its popularity and usage are primarily confined to the modern era, particularly in English-speaking countries.
People
Kayjay + last name combinations
How many people share a full name with Kayjay as the first name? Click a combination below to see the estimate, or search any pairing.
Related
Other names starting with K
Other first names starting with K with a similar number of bearers.
FAQ
Kayjay: questions and answers
How many people in the U.S. are named Kayjay?
Name Census puts the figure at roughly 5 living Americans. We arrive at this by taking every SSA birth registration for Kayjay going back to 1880 and adjusting each cohort for expected survival using CDC actuarial life tables. The result is an age-weighted living-bearer count, not a raw birth total. That works out to about 1 in 68,550,868 US residents.
Is Kayjay a common name?
We classify Kayjay as "Very Rare". It ranks above 18.2% of all first names in the SSA dataset by living bearers. Across the full history of the data, 5 babies have been registered with this name.
When was Kayjay most popular?
The single biggest year for Kayjay was 2023, when 5 babies received the name. The fact that the average living Kayjay is about 3 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
What does the SSA popularity chart show?
The chart tracks births, not the number of people alive with the name today. Each point shows how many babies were given the name Kayjay in that year. That makes it useful for spotting when the name rose, peaked, or faded.
Is Kayjay a male name?
Yes, 100.0% of people registered as Kayjay in the SSA data are male. You can see the full per-sex comparison in the gender distribution section above, which includes the latest year rank, birth count, and peak year for each sex.
Is Kayjay still being used today?
Yes. The SSA still recorded Kayjay in 2024, and the page above shows its latest-year rank where available. A name can be well past its peak and still remain in steady use, especially if it built up a large population over earlier decades.
Why can a name have a lot of living bearers even if it is not trendy now?
Because living-bearer counts and current baby-name popularity measure different things. A name like Kayjay can build up a very large population over many decades, even if fewer parents are choosing it now than they did at its peak.
Where does this data come from?
First-name figures come from the Social Security Administration's national baby name files, which cover every name on a birth certificate from 1880 to 2024. Living-bearer estimates layer in CDC actuarial life tables broken out by sex to account for mortality. The population baseline (342,754,338) is the Census Bureau's latest national estimate. You can read the full calculation on our methodology page.
Does every first name have Census demographic data?
No. The public Census first-name release only covers names that met the Bureau's publication rules, so many rarer names in the SSA files do not have a published Census demographic snapshot. In those cases, the page still shows the SSA trend, gender history, and state data.
How common is the name Kayjay?
See how many people share the name Kayjay on HowManyOfMe.org, our sister site built around that single question.