McIlwain family name history and map
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McIlwain in 1911 Ireland
The 1911 Census recorded 141 people named McIlwain in Ireland; roughly one in every 31,000 people carried the name. The name was split fairly evenly between men and women: 67 men and 72 women. (A small number, 2, had no sex recorded.)
Counties and map with McIlwain in Ireland
The McIlwains were heavily concentrated in Antrim, home to 62.4% of them (88 people). Next came Down (32), Tyrone (7), Cavan (5) and Monaghan (3).

McIlwain average age in 1911
The average McIlwain in 1911 was 33.6 years old, 33.4 for men and 33.7 for women; noticeably older 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.
McIlwain literacy in 1911
Of the McIlwains whose literacy was recorded, 92.1% could both read and write, 0.7% could read but not write, and 7.2% could do neither. Women came out slightly ahead, 93.1% reading and writing against 91% of men. 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.
McIlwain common first names
The most common male names were John (15), William, James, Robert and Samuel. For women it was Elizabeth (6), followed by Eliza Jane, Jane, Mary and Eliza.
McIlwain occupations in 1911
The most common entry on a McIlwain's census form was "Scholar"; 20.6% (29) were children at school. Among the rest, the most common occupations were farmer (12.8%), shopkeeper / shop assistant / dealer (5.7%), general labourer (4.3%) and textile worker (4.3%). Grouped by sector, agriculture accounted for 14.2% of all McIlwains, followed by textiles & clothing, retail & commerce and general labourers.
What religion is McIlwain?
Most McIlwains, 67.4%, were Presbyterian. The remainder were mostly Anglican (23.4%), Methodist (7.1%) and Plymouth Brethren (0.7%).
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Pete F
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McIlwain statistics (1911)
Number: 141
Rank: 3,113
Average Age: 34
McIlwain in the USA (2020)
Number: 2,840
Rank: 10,736
Note: If there were less than 100 in the USA census it may show as zero.
Ref: mcilwain
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