Surname Castanho (Castanho 
) , in the world, is quite a common last name. The family name Castanho is habitual in British Virgin Islands, where it is quite a common surname, Guinea-Bissau, and Portugal. Measured by absolute frequency, this name is the most popular in Brazil, Portugal, and Angola.
| VARIANT | COUNTRY |
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| Castanho | Portugal, Brazil, Angola, France, Guinea-Bissau |
| josé ribeiro castanho Portuguese politician, PT (b. 1875) |
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| dieno castanho Brazilian journalist, BR (b. 1901) |
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thiago castanho Brazilian guitarist, BR (b. 1975) |
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| amaury castanho Brazilian journalist and priest, BR (b. 1927) |
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bianca castanho Brazilian actress, BR (b. 1979) |
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klara castanho Brazilian actress, BR |
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| jorge castanho (b. 1961) |
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| joseph castanho film producer |
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| carla denise castanho researcher (ORCID 0000-0002-7328-5479) |
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| andrea d a castanho researcher (ORCID 0000-0002-0756-3952) |
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| camila de toledo castanho researcher |
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| sky castanho actor |
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| abraham castanho Spanish poet, ES |
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| teresa castanho researcher ORCID ID = 0000-0002-4162-0359 |
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| ana castanho researcher |
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