Curious Research Information: Are You Really Irish?

Over 80 million people today claim Irish heritage. That’s more than the 4.5 million people living in Ireland today. So are you really Irish?

Over one in ten Americans claim to have Irish heritage. In fact, more Americans claim to have Irish heritage (30 million) than they claim to have English heritage (24 million). Clearly, many people believe they have ancestral roots in Ireland.

But what does history say?

Irish History


The early history of Ireland as a region is difficult to figure out. There is an absence of written records before 400 CE.

However, thanks to radiocarbon dating, we know that some of the first humans to ever set foot on Ireland appeared around 12,000 BCE. These first people appeared on Ireland near the end of the last Ice Age, when glaciers began to recede.

It wasn’t until the Ice Age ended around 8000 BCE that the early Irish spread across the island. Most residents of Ireland at the time were seafarers who had arrived from Britain. They established settlements near the coast or rivers. They primarily ate seafood, wild boars, and birds.

Evidence shows that the first domesticated plants and animals appeared in Ireland around 3000 BCE. Many stone structures around Ireland have been dated to this time. These stone structures include cairns, tombs, and small houses.

Bell Beaker Culture (2500 BCE to 500 BCE)

From 2500 BCE to 500 BCE, evidence appears of a new culture in Ireland. This culture is called the “Bell Beaker Culture” by historians and scientists because of the pottery they made. Genetic analysis of bones found from this time shows a significant migration of people throughout Europe. These people would have mixed with local populations.

Bell Beaker pottery

These beakers were only used for domestic goods in Ireland, and not for gravesites.

During this time, Ireland saw its first mines and metallurgy. Much of the island was deforested too. Some historians estimate that the population of Ireland was around 100,000 people before the Celts arrived.

The Gaels/Celts (500 BCE to 400 CE)

The first written records in Ireland appear around 500 BCE, when the Celts arrived. Genetic evidence suggests that the Celts caused much turmoil when they appeared. Over 90% of the British Isles DNA changed in just a few hundred years. The Celts also brought iron tools and metallurgy with them.

While there’s no evidence of a violent overthrow by the Celts, it’s unclear exactly how that much DNA changed so quickly.

Some Roman records indicated an interest in conquering Ireland, but they never went through with it. While the Romans never touched Ireland, their culture touched the Irish. The earliest written records in Ireland began to appear around 400 CE, when Roman rule in Britain was failing. Some Roman sources suggest they were under attack by groups that had ties with Ireland.

The Vikings (800 CE)

After Rome fell, Ireland converted to Christianity. Saint Patrick appears in the records during 430 CE. The church maintained regular records, and a more complete history of Ireland emerged.

The gradual transition to Christianity began in 300 CE, and continued for some time. During this time, England conducted small expeditions into Ireland, but made no permanent towns.

But, with the 8th century came the Vikings. The first record of a Viking incursion was in 795 CE. By the middle of the century, the Vikings established several small settlements, and built Dublin as a hub for trade. Slavery was common during this time, and many Vikings sold Irish slaves at Dublin.

Several Irish kingdoms arose during this time. These kingdoms kept the Vikings contained at bay (Literally kept them at bay. Look at the map)

The Vikings continued to raid and pillage through to the 12th century. While they were never able to capture all of Ireland, their genetics mixed with many of the Irish people.

The Norman Invasion (1160 CE)

Then came the Normans.

The Normans were an ethnic group that originated in the North of France. They invaded all over the coast of Northern Europe and England. After they invaded of England in the 11th century, they became much of the English aristocracy. Henry II, King of England, carved out a nice swathe of Britain for himself. He then set his sights on nearby Ireland.

The small kingdoms that had fended off the Vikings were no match for the unified fighting forces of Henry II. Much of their land was conquered.

With the Normans came an end to slavery. Slavery was outlawed throughout Norman lands, and the feudal system was established instead. Slavery would not reappear until the 17th century, when many Irish traded African slaves.

In the 14th century, the Norman grip on Ireland began to weaken. Norman holdings split between several lesser lords. The Black Death also killed Normans more than native Irish. Eventually, the native Irish retook hold over Ireland.

English Conquest (1540-1690)

But the resurgence of the Gaelic Irish wouldn’t last long. King Henry VIII, channeling his ancestor, decided to reconquer Ireland. He forced Irish lords to surrender to the English crown, and in return he would spare them and establish the Kingdom of Ireland

But, there would be much rebellion and confusion over the coming years. The imposition of English laws on Gaelic society led to much strife. Additionally, many English ministers or administrators could be cruel and capricious. Eventually the English crown resorted to brutal suppression and land confiscation. They also supplanted Irish Catholics with Protestants. Britain would end self-government in Ireland in the 18th century.

Genetics of Irish People

As it turns out, all these invasions and cultural exchanges have led to a blending of genetics. If you know you’re Irish, you could have any of these other groups in your DNA. Here’s a list of the groups we know for certain ended up in Ireland:

  • Post-Ice Age Explorers
  • Bell Beaker Culture
  • The Gaels
  • The Vikings
  • The Normans
  • The English

Some scientists have conducted genetic population studies of Ireland. They found all these groups genetically represented.

However, to complicate the matter, many Irish people left the island over time. Some were forced to leave because of the Viking slave trade. Some left because of famine. Others left because of war or oppression. These people have since mixed with other groups they have come into contact with.

So you could be Gaelic Irish. You could also be Viking Irish. You could also be Norman Irish. You will never know for certain until you get tested.


Please follow and like us:

27 thoughts on “Curious Research Information: Are You Really Irish?

  1. I’d liek to know which people of Ireland were known for their “second sight” as this is a trait that has appeared in my father and mother but not consistently.

  2. You can apply this to any ethnic group or country. People claim to be Irish, because their ancestors came from Ireland. It has very little to do with genetics.

  3. Thank you so much for your research. I appreciate your taking the time to publish these facts! Thank you again. Roberta Devine

  4. What would be the next step in getting a break down say how much native American and how much family history is European?

  5. Ha! I’ve only ever apologized to my ‘Irish’ friends for the potential of my Swedish,Norwegian, Fin ancestors possibly visiting their ancestors.

  6. This is very helpful. While I know that my grandfather [father’s side] came to the US from Ireland, I don’t know anything else, like where in Ireland. I’ve been told that many folks with my Irish family name came from the region around Tipperary & Kerry. How would I learn more about my family? On my mother’s side, both grandfather & grandmother came to the US from Austria, Hungary area. I’d like to learn more about that part of the family too. How would I approach these family history questions? Can you recommend a book on Irish history that might educate me more about this “Irish” background?


  7. Because I do genealogy, it is interesting to read about the different countriies, their history and how our ancestors fit in.

  8. My genetics from came back Irish, Norwegian, English, and some Swedish with a Viking history and Gaelic.
    Quite a mix. Mostly Irish though. My Brother came back basically the same as well. Our last name is Harney and my brother and I are the last of my Father’s decendants.

    1. With so much question in what constitutes “Irish,” it makes me wonder how a DNA test can tell that someone is so.

      1. Excellent question Jennifer!

        Sometimes genetic testing can’t tell the difference. Most genetic tests look for genetic markers unique to the Celts/Gaels, but as we mentioned, not all Irish people have those markers.

  9. Excellent article on “Irish”. I have just returned from two weeks there and can testify to how I felt such a connection to the history and the people, as was reflected in my own genetic make-up. Your testing was very, very helpful in helping to awaken my ancestral heritage. It’s in my blood and bones, now it’s is in my Spiritual consciousness. Thank You.

  10. A very good overall review of the genetic/cultural history of Ireland. Our own Crygenetics report showed a surprisingly high Finnish connection which I assumed was associated with the ending of the last Ice Age in Northern Europe and the mass migrations that ensued. Our known family history includes emigration from Ireland in both the early and later 19th century.
    It always good to see DNA evidence back up family lore which can, all too often, meander along courses of convenience and make-believe.
    Thank you for your much appreciated effort and research

  11. Your Irish history timeline was very interesting. When I think about it, it all makes sense. I had an Irish great-great-grandfather and his wife that came to the U.S. in the early 1800’s from Sligo. Ire. He beat the potato famine by almost 40 years. Thanks for your brief Irish missive!

  12. I have had my DNA tested from 23&Me & Ancestry.. The last up date had me at 69.3% Irish & English. That includes Scotland & Wales. I also have Dutch, Swedish, German, French, & Swiss. My genealogy in some lines goes back to the 500’s AD, & includes Vikings. Most of my ancestors came to America long before the Revolutionary War. The Dutch as early as 1660, & some English as early as 1630. There is no Native American in my DNA. I always wished as a child that there was. 😊 My husband’s Irish ancestor is John McMullan who came to America from Tralee, Ireland in 1760., & participated in the Revolutionary War as did several of my ancestors.

  13. Very interesting. I had a DNA test done through Ancestry. According to that I’m 3% Irish, 48% Northern Europe, Spain Portugal, France, what amounted to about 8% from different areas in Africa, Native American (South, Central, & Northern), Native American (Andian).. Don’t remember exact percentages without looking. What else would your testing be able to tell me?

  14. I had believed that I was 50% Irish on my father’s side and 50% Swedish on My mother’s.

    DNA results show 15% Irish and 3% Swedish. The remainder: English.

    What gives?

    1. Hi Robert!

      Great question, I’ll do my best to answer. There’s several possible reasons for this:

      1. Since you inherit 50% of your DNA from each parent, you need to divide the numbers they gave you by half.
      2. Some of your “Irish” ancestors may have been Saxons, as pointed out in this article.
      3. When sperm and egg are formed, the genes are not evenly split up by your parents. Your mother or father may give you more genes from one grandparent than another. They can also recombine. This is why you’ll get different results from a sibling.
      4. British Isles is a broad category. It is a sort of catch-all for the different populations that lived in that region of the world. While there are many subgroups, genetically they show only minor differences. Precision is nice, but accuracy is important as well.

Leave a Reply

Your email address will not be published. Required fields are marked *