Dennis family name history and map
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Dennis in 1911 Ireland
The 1911 Census recorded 320 people named Dennis in Ireland; roughly one in every 14,000 people carried the name. The name was split fairly evenly between men and women: 171 men and 146 women. (A small number, 3, had no sex recorded.)
Counties with Dennis in Ireland
Cork was Dennis country: 33.1% of them (106 people) lived there in 1911. Next came Dublin (83), Louth (21), Fermanagh (19) and Tyrone (18).

Dennis average age in 1911
The average Dennis in 1911 was 29.2 years old, 26.9 for men and 31.8 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.
Dennis literacy in 1911
Of the Dennises whose literacy was recorded, 77.2% could both read and write, 4.6% could read but not write, and 18.2% could do neither. The figures were much the same for men and 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.
Dennis common first names
The most common male names were John (29), James, Joseph, Michael and William. For women it was Mary (26), followed by Margaret, Julia, Annie and Bridget.
Dennis occupations in 1911
The most common entry on a Dennis's census form was "Scholar"; 20.3% (65) were children at school. Among the rest, the most common occupations were farmer (7.5%), general labourer (5.6%), farm labourer (4.4%) and domestic servant (2.5%). Grouped by sector, agriculture accounted for 12.2% of all Dennises, followed by general labourers, domestic service and textiles & clothing.
What religion is Dennis?
Most Dennises, 68.8%, were Roman Catholic. The remainder were mostly Anglican (25.6%), Presbyterian (2.8%), Methodist (1.2%) and Baptist (0.6%).
Visitor Notes
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Added by
Pete F
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Dennis statistics (1911)
Number: 320
Rank: 1,830
Average Age: 29
Dennisin the USA (2020)
Number: 74,379
Rank: 438
Note: If there were less than 100 in the USA census it will show as zero.
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