2000
#617
National surname rank
Recorded bearers 49,925
First available Census row
Per 100,000 18.51
Uncommon Last name
Callahan
An Irish surname derived from the Gaelic "Ó Ceallacháin," meaning "descendant of Ceallachán," a personal name meaning "bright-headed."
According to the 2020 US Census Bureau surname tables, roughly 56,030 Americans carry the last name Callahan. That puts it at #682 in the national surname ranking, appearing at a frequency of 16.35 per 100,000 people (about 1 in 6,117 residents).
This page is the full Name Census profile for the Callahan surname. You will find the Census Bureau frequency data, a multi-census history view, an ancestry and ethnicity breakdown based on self-reported demographics, the name's meaning and origin where available, and answers to the most common questions people ask about this surname.
For British records, Name Census UK has a British surname profile for Callahan with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
56K
1 in 6,117
Census rank
#682
2020 decennial data
Per 100,000
16.3
Frequency rate
Recorded bearers
49K
uncommon in the US
Popularity narrative
The Census Bureau recorded 48,861 bearers of the surname Callahan in its 2020 decennial surname file. At a rate of 16.35 per 100,000 residents, it holds the 682nd position in the national surname ranking.
Among Census respondents with the surname Callahan, the largest self-reported group is White at 86.8%. The next largest groups are Black (5.2%) and Two or More Races (3.5%).
Origin
Meaning and origin of Callahan
The surname Callahan has its origins in Ireland, with the earliest records dating back to the 12th century. It is derived from the Gaelic words "O Ceallachain," which translate to "descendant of Ceallachan." Ceallachan was a personal name meaning "bright-headed" or "bright-haired."
The Callahans were one of the leading families in the territory of Uí Mhaine, which is now part of County Galway. They were influential in the region for several centuries and played a significant role in Irish history. The name is also associated with County Cork, where many Callahans have their roots.
One of the earliest recorded instances of the name can be found in the Annals of Inisfallen, a medieval Irish chronicle. The text mentions a Ceallachan mac Buadacháin, who was the king of Cashel in the 10th century. This suggests that the Callahan name has a long and distinguished lineage in Ireland.
In the 16th century, the Callahans were among the many Irish families dispossessed of their lands during the Plantation of Munster, a campaign of colonization and confiscation undertaken by the English Crown. Many Callahans were forced to relocate to other parts of Ireland or emigrate to other countries.
Notable individuals with the Callahan surname include:
1. Daniel Callahan (1930-2022), an American philosopher and bioethicist.
2. Jared Callahan (1981-), an American professional wrestler better known by his ring name David Hart Smith.
3. Patrick Callahan (1849-1904), an American baseball player and manager who played in the major leagues between 1876 and 1889.
4. Kitty Callahan (1853-1920), an American vaudeville performer and dancer known as the "Queen of the West."
5. William Callahan (1835-1905), an Irish-American politician who served as the 37th Mayor of New York City from 1887 to 1888.
Throughout its history, the Callahan name has been spelled in various ways, including O'Callaghan, Callaghan, Callahan, and Calahan. These variations reflect the name's evolution as it spread across different regions and encountered different linguistic influences.
Demographics
Ancestry and ethnicity for Callahan
Among Census respondents with the surname Callahan, the largest self-reported group is White at 86.8%. The next largest groups are Black (5.2%) and Two or More Races (3.5%).
The bar chart below shows how Callahan bearers described their own race and ethnicity on the 2020 Census form. The Census Bureau groups responses into six broad categories: White, Black or African American, Hispanic or Latino, Asian and Pacific Islander, American Indian and Alaska Native, and Two or More Races. When a category has too few respondents for a given surname, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown for every Census year so the breakdown stays comparable over time. When the source file also includes raw headcounts, Name Census shows those alongside the percentages in the legend.
Keep in mind that these are self-reported numbers. A person's surname does not determine their race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the Callahan surname at the time of the 2020 Census, not any inherent property of the name itself.
- White86.8% · 42,404
- Black or African American5.2% · 2,550
- Two or more races3.5% · 1,710
- Hispanic or Latino3.3% · 1,588
- Asian and Pacific Islander0.7% · 354
- American Indian and Alaska Native0.5% · 255
Timeline
Historical Census data for Callahan
Callahan appears in 3 published Census surname files: 2000, 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2010
#682
National surname rank
Recorded bearers 50,524
+599 bearers (+1.2%)
Per 100,000 17.13
Rank movement Down 65 places
2020
#682
National surname rank
Recorded bearers 48,861
-1,663 bearers (-3.3%)
Per 100,000 16.35
Rank movement No rank change
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #617 | 49,925 | 18.51 | First available Census row | First available Census row |
| 2010 | #682 | 50,524 | 17.13 | +599 bearers (+1.2%) | Down 65 places |
| 2020 | #682 | 48,861 | 16.35 | -1,663 bearers (-3.3%) | No rank change |
For 2020, the Census Bureau published race and Hispanic-origin columns as counts rather than percentages. Name Census converts those counts back into shares so the ancestry section stays comparable with the older surname files.
Year on year
2010 vs 2020 Census
How has the Callahan surname changed between Census years? The chart shows bearer count side by side, and the table compares rank, count, and frequency.
Census year comparison
20102020
| Metric | 2010 | 2020 | Change |
|---|---|---|---|
| Rank | #682 | #682 | 0.0% |
| Count | 50,524 | 48,861 | -3.3% |
| Per 100K | 17.13 | 16.35 | -4.6% |
Between the 2010 and 2020 Census, the number of Callahan bearers went from 50,524 to 48,861 (-3.3% change). The surname held its position in the national ranking, remaining at #682.
FAQ
Callahan surname: questions and answers
How many people in the U.S. have the surname Callahan?
Name Census estimates that about 56,030 living Americans carry the surname Callahan. Using the current population baseline, that works out to roughly 1 in 6,117 residents.
How common is Callahan?
Callahan ranks #682 in the 2020 Census surname tables and is classified on this site as "Uncommon." The Census recorded the name at a frequency of 16.35 per 100,000 residents, which is about 16 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 48,861 people with the surname Callahan. That is different from the site's living-bearer estimate (56,030), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 16.35 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 16.35 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 16 of them to have the surname Callahan.
Has Callahan become more or less common over time?
Between 2010 and 2020, the surname Callahan went from 50,524 recorded bearers to 48,861. That is a decrease of 1,663 (-3.3%). In the national ranking it stayed at #682.
What does the Census say about the background of Callahan?
Among Census respondents with the surname Callahan, the largest self-reported group is White at 86.8%. The next largest groups are Black (5.2%) and Two or More Races (3.5%). These figures come from the 2020 Census Bureau surname tables, based on how respondents described their own race and ethnicity.
Which group reports this surname most often?
White is the largest self-reported group for the surname Callahan in the 2020 Census, accounting for 86.8% (42,404 people in the source table).
What is the full ancestry breakdown?
Callahan appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (86.8%), Black (5.2%), Two or More Races (3.5%). For 2020, the source file also published raw headcounts for each group, which is why this page can show both percentages and counts in the ancestry section.
Is this page using the latest Census data?
Yes. This page is using the latest surname file currently loaded on Name Census, which is 2020. The historical section above also keeps any older Census surname entries we have for Callahan (2000, 2010, 2020).
Does the Census include every surname?
No. The Census Bureau only publishes surnames that appeared at least 100 times in a given decennial Census. That means very rare surnames are excluded entirely, and a surname can appear in one Census release but disappear from a later one if it falls below the reporting threshold.
Why don't the ancestry percentages always add up to exactly 100%?
There are two main reasons: rounding and suppression. The Census Bureau rounds published values, and it may suppress very small cells to protect privacy. For 2020, the Bureau also published raw group counts rather than direct percentages, so Name Census converts those counts back into shares for comparability across census years.
What does Callahan mean?
An Irish surname derived from the Gaelic "Ó Ceallacháin," meaning "descendant of Ceallachán," a personal name meaning "bright-headed." The fuller origin note on this page goes into more detail.
Where does the surname data come from?
All surname statistics on Name Census are drawn from the US Census Bureau's decennial surname frequency tables. These files list every surname that appeared 100 or more times in the 2020 Census, along with a count, a per-100,000 rate, and a self-reported demographic breakdown. You can read the full explanation on our methodology page.
How does Name Census estimate living bearers?
For surnames, Name Census does not age cohorts the way it does for first names. Instead, it takes the Census Bureau's published frequency for Callahan (16.35 per 100,000) and applies that rate to the current U.S. resident population to estimate how many living Americans have the surname today.
How many Americans have the surname Callahan?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.