Silva

With 4,080,029 bearers, Silva is the 7th most common surname in Brazil (2014 Data). With 283,326 bearers, Silva is the 1st most common surname in Portugal (2014 Data). With 129,716 bearers, Silva is the 8th most common surname in Chile (2014 Data). With 58,625 bearers, Silva is the 7th most common surname in Guinea-Bissau (2014 Data). With 34,927 bearers, Silva is the 7th most common surname in Uruguay (2014 Data). With 11,205 bearers, Silva is the 7th most common surname in Cape Verde (2014 Data).

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Source: https://forebears.io/surnames/silva

Where I live, almost everyone is Portuguese, so I know SOOOO many people with this last name.

Silva is also a Galician and Jewish (Sephardic) surname.

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Scripts: סילבה (Hebrew)

Very, very, VERY common last name in Brazil. In fact, I think this is Brazil's most common last name. The variant da Silva is also quite common. [noted -ed]