McDermott Surname in Ireland
The Griffith Valuation was a survey done in the years from
1848-1864 of everyone who owned and/or rented
land in Ireland. Since no census records of
Ireland exist for this time period, the Griffith
Valuation is the only way of learning who lived
where in Ireland at that time.
The map above shows the distribution of the
surname McDermott in Ireland in the mid-1800s as
listed in the Griffith Valuation of Ireland. The
color of a county indicates the how many
McDermotts were listed as residing there in the
mid-1800s. Bright green indicates the counties
that had the largest number of McDermotts. Lighter
shades of green indicate counties containing fewer
McDermotts, while dark gray and light gray indicate
counties with even fewer McDermotts. Counties that
contained less than 45 McDermotts are not colored -
so the map only shows where 85% of the McDermotts
were living.
According to the
historical account
the McDermott name is used by the descendents of
two (or possibly three) Irish septs that
originated in the area of the northern County
Roscommon, and southern County Sligo. This agrees
roughly with the distribution shown in the map.
There were about 1900 people listed in the Valuation
with the surname of McDermott - and about a quarter of
these of these were in County Roscommon.
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