Denn family name history and map
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Denn in 1911 Ireland
The 1911 Census recorded 72 people named Denn in Ireland; roughly one in every 61,000 people carried the name. The name was split fairly evenly between men and women: 34 men and 38 women.
Counties and map with Denn in Ireland
Waterford was Denn country: 37.5% of them (27 people) lived there in 1911. Next came Tipperary (24), Kilkenny (14), Cork (2) and Galway (2).

Denn average age in 1911
The average Denn in 1911 was 27.7 years old, 26.7 for men and 28.6 for women; a touch younger than 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.
Denn literacy in 1911
Of the Denns whose literacy was recorded, 75% could both read and write, 4.2% could read but not write, and 20.8% could do neither. Men came out slightly ahead, 79.4% reading and writing against 71.1% 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.
Denn common first names
The most common male names were William (5), Edmond, John, Patrick and Thomas. For women it was Mary (10), followed by Ellen, Bridget, Johanna and Margaret.
Denn occupations in 1911
The most common entry on a Denn's census form was "Scholar"; 23.6% (17) were children at school. Among the rest, the most common occupations were farmer (19.4%), domestic servant (4.2%), farm labourer (4.2%) and carpenter / joiner (2.8%). Grouped by sector, agriculture accounted for 25% of all Denns, followed by domestic service, building & construction and professional.
What religion is Denn?
Denns were overwhelmingly Roman Catholic, 98.6% of them. The remainder were mostly Anglican (1.4%).
Visitor Notes
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Added by
Pete F
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Denn statistics (1911)
Number: 72
Rank: 4,678
Average Age: 28
Denn in the USA (2020)
Number: 990
Rank: 26,016
Note: If there were less than 100 in the USA census it may show as zero.
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