Dea family name history and map
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Dea in 1911 Ireland
The 1911 Census recorded 275 people named Dea in Ireland; roughly one in every 16,000 people carried the name. The name was split fairly evenly between men and women: 144 men and 131 women.
Counties with Dea in Ireland
Cork had the largest share of Deas, 22.5% (62 people). Next came Tipperary (59), Mayo (38), Laois (31) and Offaly (25).

Dea average age in 1911
The average Dea in 1911 was 29.4 years old, 29.1 for men and 29.7 for women; almost exactly in line with the national averages of 29.6 for men and 30.5 for women. That low figure reflects just how many children there were in Edwardian Ireland, along with high infant mortality and the limits of public health at the time. For comparison, average life expectancy in Ireland today is around 83.
Dea literacy in 1911
Of the Deas whose literacy was recorded, 77.3% could both read and write, 3.3% could read but not write, and 19% could do neither. Men came out slightly ahead, 78.9% reading and writing against 75.6% of women. Bear in mind these figures include young children; the census itself only counted people aged nine and over when calculating illiteracy, on the grounds that it was unfair to label a child illiterate before they'd had a chance to learn.
Dea common first names
The most common male names were John (21), James, Michael, Patrick and Thomas; the same five names that topped the list nationally. For women it was Mary (24), followed by Bridget, Ellen, Margaret and Kate.
Dea occupations in 1911
The most common entry on a Dea's census form was "Scholar"; 24.7% (68) were children at school. Among the rest, the most common occupations were farmer (10.9%), farm labourer (7.3%), general labourer (7.3%) and domestic servant (3.6%). Grouped by sector, agriculture accounted for 18.9% of all Deas, followed by general labourers, domestic service and retail & commerce.
What religion is Dea?
Deas were overwhelmingly Roman Catholic, 95.6% of them.
Visitor Notes
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Added by
Pete F
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Dea statistics (1911)
Number: 275
Rank: 2,041
Average Age: 29
Deain the USA (2020)
Number: 1,325
Rank: 20,291
Note: If there were less than 100 in the USA census it will show as zero.
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