So it is autonomous, but not sovereign because together with 3 other countries part of a kingdom. Whether you see that as owning or not is a matter of semantics. If you regard being part of similar to being owned or not.
Normally, only the paternal is used in everyday speaking, but in this case with this author, his name and paternal last name are rather common, so the maternal last name is used to further differenciate.
Now, this works with Spanish-speaking people, but not with Portuguese-speaking names, who put the paternal last name at the end, and also can have up to 4 last names (!)
Natal (Brazilian Portuguese: [naˈtaw] ) is the capital and largest city of the state Rio Grande do Norte, located in northeastern Brazil.