Explore the Family Name Mortensen

The meaning of Mortensen

Danish, Norwegian, and North German: patronymic from the personal name Morten, a vernacular form of Martin 1. Some characteristic forenames: Scandinavian Erik, Niels, Lars, Morten, Einer, Jorgen, Bent, Britt, Carsten, Egil, Gunner, Hartvig.

Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022.

How common is the last name Mortensen in the United States?

Based on the Decennial U.S. Census data, the surname Mortensen experienced a minor shift in popularity between the years 2000 and 2010. In 2000, Mortensen had a rank of 3211 which slightly dropped to 3282 in 2010, indicating a decrease in popularity by 2.21%. However, despite this drop, the actual count of individuals with the Mortensen surname increased from 10208 to 11013, a growth of 7.89%. The proportion of this surname per 100,000 people also saw a slight dip from 3.78 to 3.73.

Proportion per 100k3.783.73-1.32%

Race and Ethnicity of people with the last name Mortensen

Regarding ethnic identity, the Decennial U.S. Census data shows that the majority of individuals with the Mortensen surname identified as White, though there was a slight decrease from 95.03% in 2000 to 93.48% in 2010. There was an increase in the percentage of individuals identifying as Hispanic, rising from 2.46% to 3.40%. Asian/Pacific Islander, Black, and American Indian and Alaskan Native identities also saw increases, albeit smaller. Those identifying as Asian/Pacific Islander rose from 0.86% to 0.92%, Black identifiers went from 0.18% to 0.37%, and those identifying as American Indian and Alaskan Native climbed from 0.18% to 0.30%. Individuals reporting two or more races increased from 1.29% to 1.53%.

Two or More Races1.29%1.53%18.6%
Asian/Pacific Islander0.86%0.92%6.98%
American Indian and Alaskan Native0.18%0.3%66.67%

Mortensen 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 Mortensen is British & Irish, which comprises 40.7% of all ancestry found in people with the surname. The next two most common ancestries are French & German (23.9%) and Scandinavian (18.8%). Additional ancestries include Eastern European, Italian, Spanish & Portuguese, Indigenous American, and Ashkenazi Jewish.

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British & Irish40.7%
French & German23.9%

Possible origins of the surname Mortensen

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 Mortensen have recent ancestry locations all within United Kingdom.

RECENT ANCESTRY LocationPercentage
Greater London, United Kingdom83.30%
Greater Manchester, United Kingdom83.30%
West Midlands, United Kingdom83.00%
Merseyside, United Kingdom83.00%
Tyne And Wear, United Kingdom82.70%

What Mortensen 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 Mortensen is I-Z60, which is predominantly found among people with European ancestry. Haplogroup I-Z60 is descended from haplogroup I-M170. Other common haplogroups include I-Z58 and R-Z282, which are predominantly found among people with European and European ancestry. Other surnames with similar common haplogroups are: Christiansen, Johansen, Monson, Jorgensen, Albrecht, Jensen, Christensen, Knudsen, Larsen, Nielsen.

The most common maternal haplogroups of people with Mortensen surname are: H1, T2b, H. These most commonly trace back to individuals of European ancestry.

mortensenPaternal Haplogroup Origins I-M170
Paternal Haplo Image

Your paternal lineage may be linked to Alexander Hamilton

Early in the morning on July 11, 1804, Aaron Burr (then Vice President of the United States) and Alexander Hamilton (founder of the U.S. Treasury) dueled on the New Jersey side of the Hudson River. This marked the culmination of a bitter personal and political rivalry between the two men. Alexander Hamilton died as a result of the duel, but his intellectual legacy survives in the founding documents of the nation he helped build. A piece of his genetic legacy survives as well: in the 21st century, genealogists documented the paternal haplogroups of dozens of Hamilton's living descendants and concluded that the Founding Father's paternal haplogroup was a branch of I-DF29.

Your 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.

Maternal Haplo Image

What do people with the surname Mortensen 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.



Chocolate Ice Cream

Prefers chocolate flavored ice cream over other flavors.

"Mortensen" Surname 38.0%

23andMe Users 41.3%




When sounds made by others, like the sound of chewing or yawning, provoke strong emotional reactions in an individual.

"Mortensen" Surname 22.4%

23andMe Users 27.9%



Sugary Drink

Drinks one or more sugary drinks per day.

"Mortensen" Surname 18.8%

23andMe Users 21.1%




A severe headache characterized by intense pain, sensitivity to light and sound, and often accompanied by nausea and vomiting.

"Mortensen" Surname 19.2%

23andMe Users 16.4%

Are health conditions linked to the last name Mortensen?

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 Mortensen are shown below. Important Note: not everyone with a disease allele will develop these health condition

Age-Related Macular Degeneration

Y402H variant

Age-related macular degeneration (AMD) is the most common cause of irreversible vision loss among older adults. The disease results in damage to the central part of the retina (the macula), impairing vision needed for reading, driving, or even recognizing faces. The 23andMe Health + Ancestry DNA test includes the two most common variants associated with an increased risk of developing the condition: the Y402H variant in the CFH gene and the A69S variant in the ARMS2 gene. Learn more about Age-Related Macular Degeneration

British & Irish 62.1%

23andMe Users 57.2%