Portuguese is main language of Brazil.
Something about orange and Portugal
The name Portugal refers to the orange fruit, not the country. Orange in many parts of the world (Greece, Bulgaria, Romania and I think some Arabic countries) is still called something like "Portucalle"
Interesting isn't it.
I believe Portgas D rouge has some connection. Road to laugh tale did hint at romance of Rouge and Roger. Portgas could be based on Portugal.