Jeffers family name history and map
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Jeffers in 1911 Ireland
The 1911 Census recorded 521 people named Jeffers in Ireland; roughly one in every 8,400 people carried the name. The name was split fairly evenly between men and women: 251 men and 269 women. (A small number, 1, had no sex recorded.)
Counties with Jeffers in Ireland
Cork had the largest share of Jefferses, 20.2% (105 people). Next came Armagh (100), Mayo (79), Down (58) and Tyrone (30).

Jeffers average age in 1911
The average Jeffers in 1911 was 28.0 years old, 26.7 for men and 29.1 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.
Jeffers literacy in 1911
Of the Jefferses whose literacy was recorded, 78.1% could both read and write, 3.4% could read but not write, and 18.5% 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.
Jeffers common first names
The most common male names were James (34), John, Thomas, William and Michael. For women it was Mary (35), followed by Annie, Bridget, Anne and Elizabeth.
Jeffers occupations in 1911
The most common entry on a Jeffers's census form was "Scholar"; 22.8% (119) were children at school. Among the rest, the most common occupations were farmer (11.1%), general labourer (4%), farm labourer (2.9%) and textile worker (2.9%). Grouped by sector, agriculture accounted for 14.2% of all Jefferses, followed by textiles & clothing, domestic service and general labourers.
What religion is Jeffers?
The largest religious group among Jefferses was Roman Catholic, at 44.5%. The remainder were mostly Anglican (26.9%), Presbyterian (17.5%), Methodist (4%) and Plymouth Brethren (1.9%).
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Pete F
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Jeffers statistics (1911)
Number: 521
Rank: 1,309
Average Age: 28
Jeffersin the USA (2020)
Number: 16,537
Rank: 2,129
Note: If there were less than 100 in the USA census it will show as zero.
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