快速答案
nome 泛指姓名，在表格中常指名；sobrenome 指姓氏。
可靠的方法是先判断这个词在句子里的功能，再翻译。
每个词的作用
nome
given name or name
Use nome for the name used to identify a person or thing.
sobrenome
family name or surname
Use sobrenome for the part of a personal name shared with family.
如何选择
- nome: Choose nome if the sentence points to the name used to identify a person or thing.
- sobrenome: Choose sobrenome if the sentence points to the part of a personal name shared with family.
例句
Meu nome é Ana.
My name is Ana.
Meu sobrenome é Silva.
My surname is Silva.
常见误区
Brazilian full names can contain several surnames. Do not assume the final word is the only family name.
放到语境中练习
从你的真实生活中选一个句子，写两遍：一次用 nome，一次用 sobrenome。如果两个版本都可以，说明意思怎样变化。