Haplogroup I

What is Maternal Haplogroup I?

Haplogroup I is a genealogical group of lineages defined by unique genetic markers present in your mitochondrial DNA, which is transmitted from your mother. Your maternal haplogroup paints a picture of your ancient origins and the migrations of your ancestors. Although your maternal haplogroup reflects just one of your many ancestral lineages, it carries information about that lineage over tens of thousands of years.

Among 23andMe research participants, haplogroup I is commonly found among populations in the United Kingdom and Ireland.

It's important to note that your haplogroup doesn't define your current ethnic identity; rather, it provides an insight into your deep ancestry on the maternal side.

Maternal Haplogroup Origins I

Top Surnames with Haplogroup I

For surnames with sufficient representation in the data, these percentages represent the frequency with which each surname is found in individuals exhibiting this genetic marker.

Last Name	Frequency
smith	1.30%
johnson	0.80%
miller	0.70%
williams	0.70%
jones	0.60%
davis	0.60%
anderson	0.60%
brown	0.60%
taylor	0.40%
roberts	0.40%
baker	0.40%
young	0.30%
martin	0.30%
moore	0.30%
stewart	0.30%
thompson	0.30%
wilson	0.30%
white	0.30%
morgan	0.30%
king	0.30%

Haplogroup I is linked to Icelanders with Viking and British-Irish descent

Some Icelanders also bear haplogroup I, a suggestion that their ancestry traces back to British and Irish women who were taken away from their homes by Viking raiders during the 9th and 10th centuries AD. But haplogroup I also appears to have been present in Scandinavia during the Viking era. Ancient DNA belonging to the haplogroup was extracted from skeletal remains at an early Christian cemetery in Denmark.Today, haplogroup I is very rare in Denmark. But it is found at a level of about 4% in Finland and 2% in other parts of Scandinavia.

Viking Longship at Sunset