NameCensus.
Very Rare

Kierran

A masculine name of Irish origin meaning "little dark one".

Name Census estimates that about 5 living Americans carry the first name Kierran. The name is used almost exclusively for boys. The average person named Kierran today is around 9 years old, and the year with the single highest number of Kierran births was 2017 (5 babies).

This page is the full Name Census profile for Kierran. 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 Kierran with official rankings and popularity over time.

Key insights

  • Fewer than 100 living Americans are believed to carry the name Kierran. It is among the rarest names in the SSA records.

People living today

5

~ 1 in 68,550,868 Americans

Peak year

2017

5 babies that year

Average age

9

years old

2017 SSA rank

#13,356

Tracked since 2017

Popularity

Kierran: popularity over time

Babies born per year

01345

Decades

Kierran 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 Kierran during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.

DecadeMaleFemaleTotal
2010s505

Origin

Meaning and history of Kierran

The name Kierran is believed to have originated from the Irish Gaelic language, with roots dating back to the early medieval period in Ireland. It is a variant spelling of the name Ciarán, which is derived from the Old Irish word "ciar" meaning "dark" or "black," referring to the color of one's hair or complexion.

One of the earliest recorded mentions of the name Ciarán can be found in the Annals of Ulster, a chronicle of medieval Irish history, where it refers to Saint Ciarán, a renowned Irish monk and monastic founder who lived in the 6th century AD. He is best known for establishing the famous monastery of Clonmacnoise in County Offaly, which became a significant center of learning and spirituality in ancient Ireland.

Throughout the Middle Ages, the name Ciarán and its variants, such as Kierran, were widely used among Irish families, particularly those with ancestral ties to the provinces of Connacht and Ulster. It was a popular choice for parents seeking to honor the legacy of Saint Ciarán or to convey the qualities of leadership and piety associated with his life.

One notable historical figure bearing the name Kierran was Kierran O'Donnell, an Irish chieftain and military leader who lived in the 16th century. He played a significant role in the Gaelic Irish resistance against the English Tudor conquest of Ireland, leading his clan in several battles against the English forces.

Another prominent individual with the name Kierran was Kierran Fitzpatrick, an Irish Jacobite soldier and officer who fought in the Williamite War in Ireland during the late 17th century. He participated in several key battles, including the Battle of the Boyne in 1690, where he served under the command of the deposed King James II.

In more recent times, Kierran Muir was a Scottish historian and author who lived from 1930 to 2016. He specialized in the history of the Scottish Highlands and was known for his extensive research on clan systems and the Jacobite uprisings.

Kierran Mulcare was an Irish-American architect and urban planner who made significant contributions to the development of cities in the United States during the mid-20th century. He was involved in the design and planning of several notable projects, including the renovation of Times Square in New York City.

While the name Kierran has retained its Irish roots, it has also gained popularity in other parts of the world, particularly in English-speaking countries with strong Irish cultural influences or connections. Its enduring use reflects the rich heritage and historical significance associated with this ancient Gaelic name.

People

Kierran + last name combinations

How many people share a full name with Kierran 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

Kierran: questions and answers

How many people in the U.S. are named Kierran?

Name Census puts the figure at roughly 5 living Americans. We arrive at this by taking every SSA birth registration for Kierran 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 Kierran a common name?

We classify Kierran 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 Kierran most popular?

The single biggest year for Kierran was 2017, when 5 babies received the name. The fact that the average living Kierran is about 9 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 Kierran in that year. That makes it useful for spotting when the name rose, peaked, or faded.

Is Kierran a male name?

Yes, 100.0% of people registered as Kierran 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 Kierran still being used today?

Yes. The SSA still recorded Kierran 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 Kierran 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 many Americans are named Kierran?

For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.

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