Surname Grefa
Country and Region Rankings
| Region | Rank | Count |
| Ecuador, Napo-province | 1 | 5.8k |
| Ecuador, Orellana-province | 1 | 3.6k |
| Ecuador, Sucumbíos-province | 3 | 1.7k |
| Ecuador, Pastaza-province | 4 | 1.1k |
| Peru, Loreto-region | 252 | <1k |
| Colombia, Putumayo-department | 686 | <1k |
Famous People with surname Grefa
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