Explore the Family Name Monahan
The meaning of Monahan
Irish: Anglicized form of Gaelic Ó Manacháin ‘descendant of Manachán’, a personal name representing a diminutive of manach ‘monk’. See also Monk. The Gaelic name is sometimes interpreted as if it were Ó Muineacháin ‘descendant of the little shrubbery’, and is sometimes translated into English as Thornton. The name is also found in Scotland. Some characteristic forenames: Irish Brendan, Fergus, Murphy, John Patrick, Kevin Patrick, Paddy.
Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022.
How common is the last name Monahan in the United States?
Based on the Decennial U.S. Census, the surname Monahan has seen a minor shift in its popularity from 2000 to 2010. Ranked at 2213 in 2000, it fell slightly to 2347 in 2010, marking a 6.06% decrease in its rank. However, the actual count of individuals with the Monahan surname increased by 3.15%, climbing from 15,058 in 2000 to 15,533 in 2010. This resulted in a minor drop in the proportion per 100k, going down by 5.56% from 5.58 to 5.27.
| 2000 | 2010 | Change | |
|---|---|---|---|
| Rank | #2,213 | #2,347 | -6.06% |
| Count | 15,058 | 15,533 | 3.15% |
| Proportion per 100k | 5.58 | 5.27 | -5.56% |
Race and Ethnicity of people with the last name Monahan
When examining the ethnic identity associated with the surname, data from the Decennial U.S. Census reveals that there have been several changes from 2000 to 2010. Notably, there was a significant increase in individuals identifying as Black, rising by 261.11%. The percentage of those identifying as Asian/Pacific Islander also increased by 41.51%, and those identifying as Hispanic saw an increase of 53.18%. Individuals with the surname Monahan who identified as having two or more races went up by 63.16%. The count for those identifying as American Indian and Alaskan Native remained nearly steady with only a 3.03% change. Interestingly, the count of those identifying as White experienced a slight dip, decreasing by 2.18% over the decade.
| 2000 | 2010 | Change | |
|---|---|---|---|
| White | 96.47% | 94.37% | -2.18% |
| Hispanic | 1.73% | 2.65% | 53.18% |
| Two or More Races | 0.76% | 1.24% | 63.16% |
| Asian/Pacific Islander | 0.53% | 0.75% | 41.51% |
| Black | 0.18% | 0.65% | 261.11% |
| American Indian and Alaskan Native | 0.33% | 0.34% | 3.03% |
Monahan ancestry composition
23andMe computes an ancestry breakdown for each customer. People may have ancestry from just one population or they may have ancestry from several populations. The most commonly-observed ancestry found in people with the surname Monahan is British & Irish, which comprises 58.5% of all ancestry found in people with the surname. The next two most common ancestries are French & German (15.0%) and Eastern European (6.4%). Additional ancestries include Italian, Scandinavian, Spanish & Portuguese, Ashkenazi Jewish, and Indigenous American.
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| ANCESTRY BREAKDOWN | COMPOSITION |
|---|---|
| British & Irish | 58.5% |
| French & German | 15.0% |
| Eastern European | 6.4% |
| Other | 20.1% |
Possible origins of the surname Monahan
Your DNA provides clues about where your recent ancestors may have lived. Having many distant relatives in the same location suggests that you may all share common ancestry there. Locations with many distant relatives can also be places where people have migrated recently, such as large cities. If a large number of individuals who share your surname have distant relatives in a specific area, it could indicate a connection between your surname and that location, stemming from either recent ancestral ties or migration.
Based on 23andMe data, people with last name Monahan have recent ancestry locations in United Kingdom and Ireland.
| RECENT ANCESTRY Location | Percentage |
|---|---|
| Merseyside, United Kingdom | 85.00% |
| Greater Manchester, United Kingdom | 85.00% |
| Greater London, United Kingdom | 85.00% |
| Glasgow City, United Kingdom | 84.70% |
| West Midlands, United Kingdom | 84.50% |
What Monahan haplogroups can tell you
Haplogroups are genetic population groups that share a common ancestor on either your paternal or maternal line. These paternal and maternal haplogroups shed light on your genetic ancestry and help tell the story of your family.
The top paternal haplogroup of people with the surname Monahan is R-CTS241, which is predominantly found among people with European ancestry. Haplogroup R-CTS241 is descended from haplogroup R-M343. Other common haplogroups include R-L21 and R-S476, which are predominantly found among people with European and European ancestry. Other surnames with similar common haplogroups are: Mccarthy, Devine, Mcgowan, Brennan, Monaghan, Doran, Mckeon, Mahoney, Cameron, Griffiths.
The most common maternal haplogroups of people with Monahan surname are: H1, T2b, H. These most commonly trace back to individuals of European ancestry.
Paternal Haplogroup Origins R-M343Your maternal lineage may be linked to Marie Antoinette
Because it is so dominant in the general European population, haplogroup H also appears quite frequently in the continent's royal houses. Marie Antoinette, an Austrian Hapsburg who married into the French royal family, inherited the haplogroup from her maternal ancestors. So did Prince Philip, Duke of Edinburgh, whose recorded genealogy traces his female line to Bavaria. Scientists also discovered that famed 16th century astronomer Nicolaus Copernicus traced his maternal lineages to haplogroup H.
What do people with the surname Monahan have in common?
Spoiler alert: it's complicated. People with the same last name are usually no more genetically similar than a randomly sampled group of people from the same population. That said, people with the same surname are more likely to have similar ancestries than randomly sampled individuals. The reason is the tendency of people with similar cultural or geographical backgrounds to preferentially mate with one another. That's why people who share a surname may be more likely to share traits and tendencies in common than people within the general population. Check out the percentages below to see the prevalences of tastes, habits, and traits of people with your surname compared with prevalences among 23andMe users.
Preferences
Chocolate Ice Cream
Prefers chocolate flavored ice cream over other flavors.
"Monahan" Surname 41.6%
23andMe Users 41.3%
Traits
Misophonia
When sounds made by others, like the sound of chewing or yawning, provoke strong emotional reactions in an individual.
"Monahan" Surname 22.0%
23andMe Users 27.9%
Habits
Sugary Drink
Drinks one or more sugary drinks per day.
"Monahan" Surname 18.8%
23andMe Users 21.1%
Wellness
Migraine
A severe headache characterized by intense pain, sensitivity to light and sound, and often accompanied by nausea and vomiting.
"Monahan" Surname 15.4%
23andMe Users 16.4%
Are health conditions linked to the last name Monahan?
The short answer is that, if there is an association between surname and health, it's usually more about your ancestry than your name. Individuals with a given surname are no more genetically similar than the general population but often have similar ancestries. The populations of people associated with those shared ancestries often have sets of genetic variations, also known as alleles, in common. Some of those alleles are associated with a greater likelihood of developing certain diseases.
Disease variant frequency by ancestry
Disease allele frequencies in populations associated with the surname Monahan are shown below. Important Note: not everyone with a disease allele will develop these health condition