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O'callaghan Name Meaning
Irish: from Gaelic Ó Ceallacháin ‘descendant of
Ceallachán’, a diminutive of the personal name
Ceallach, possibly meaning ‘lover of churches’, from
ceall ‘church’, or (more likely) ‘bright-headed’, from
cen ‘head’ + lach ‘light’. This name was borne by a
10th-century king of Munster, from whom many present-day bearers of
the surname claim descent.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
114,909
Historical Documents & Family Trees with O'callaghan
Name Distribution of O'callaghan Families
MAP:
United States
England & Wales
Scotland
Number of O'callaghan families
 4 - 6  2 - 3 |
 1  |
from the 1920 US Federal Census Data
Number of O'callaghan families
|
5 - 7 2 - 4 |
1 |
from the 1891 England and Wales Census Data
Number of O'callaghan families
|
6 - 10 3 - 5 |
1 - 2 |
from the 1891 Scotland Census Data
O'callaghan census records
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O'callaghan Family Origin
O'callaghan Immigration Information
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from the New York Passenger Lists
Average Life Expectancy for O'callaghan
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from the Social Security Death Index (SSDI)
O'callaghan Family Occupations
from 1880 Federal Census Data
O'callaghan census records
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O'callaghan Civil War Service Records
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