Main country
Ireland
44,249 people
23.2% of total
Surname
O'brien
190,706 worldwide · 138 countries
190,706
Total population
138
Countries
1 in every 42,474
Frequency
Rarity
Common
Dispersion
Global
Top countries
1
Ireland
44,249
23.2%
2
United States
40,220
21.1%
3
Australia
36,925
19.4%
4
England
36,684
19.2%
5
Canada
15,900
8.3%
World distribution
Loading map...