Main country
United States
47 people
62.7% of total
Surname
Efferen
75 worldwide · 4 countries
75
Total population
4
Countries
1 in every 108,000,000
Frequency
Rarity
Rare
Dispersion
Local
Top countries
1
United States
47
62.7%
2
Netherlands
14
18.7%
3
Germany
13
17.3%
4
Belgium
1
1.3%
World distribution
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