Main country
Japan
20,754 people
97.9% of total
Surname
Ooka
21,206 worldwide · 20 countries
21,206
Total population
20
Countries
1 in every 381,967
Frequency
Rarity
Moderate
Dispersion
Regional
Top countries
1
Japan
20,754
97.9%
2
United States
169
0.8%
3
South Africa
107
0.5%
4
Guam
70
0.3%
5
Brazil
28
0.1%
World distribution
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