Are these surnames French, Spanish, or Portuguese?

[Marinus]

I was able to figure out DeCoste is (southern) French, and Arruda is Portuguese but my question is why I've met French people with Bernal?

They might have been born in France but had Catalan ancestors, in the same manner that one of my surnames is French, yet I'm a Brazilian born Iberian-Briton.

[Vasconcelos]

Never seen it. I think it's a variant of Firmino.

http://locatemyname.com/portugal/Firmino

http://locatemyname.com/portugal/Fermino

You can see Firmino has much more hits on that website in Portugal. Brazil seems to have a lot of both variants.

Cool, I can finally see where my family name is more frequent. Assuming the info is roughly correct, despite being very common everywhere it seems more frequent in Bragança, followed by the surrounding distritos

[kkk77]

Arruda is the only non foreign word to me.

I don't know anybody with that surname, but there's the Portuguese municipality of Arruda dos Vinhos.

[B01AB20]

Bernal is the Catalan variant of the Castilian Bernaldo, which in Portuguese is most often written as Bernardo.

lol...

Bernal is relatively common spanish surname, and nothing to do with 'Bernaldo' . In Spanish is Bernardo btw.

Apellido antiguo y frecuente en España, procedente del nombre Bernal, común sobre todo en Aragón durante la Edad Media española, procedente del nombre de origen germánico Berinald o Berinwald, de -berin, “oso” y -wald, “gobierno”, “mando”: “el mando del oso”.

[Mens-Sarda]

Arruda sounds like the Iberian version of the Sardinian surname Ruda (from Latin "Ruta", it's the name of a plant)

Sardinian versions of the surname are present as Ruda, Rudas, De Rudas.