Main country
Ireland
9,845 people
41.5% of total
Surname
O'callaghan
23,707 worldwide · 70 countries
23,707
Total population
70
Countries
1 in every 341,671
Frequency
Rarity
Moderate
Dispersion
Global
Top countries
1
Ireland
9,845
41.5%
2
England
5,067
21.4%
3
Australia
4,600
19.4%
4
United States
1,302
5.5%
5
Canada
673
2.8%
World distribution
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