He named his son what his father had named him.

“他给他儿子取的名字和他父亲给他取的名字相同。”

这个句子的结构，跟前几天讨论的句子是一样的结构。what his father had named him 是名词性从句，作宾补。

这个翻译也是正确的。我们演绎一下：

1. He named his son Tom. 他给他的儿子取名汤姆。

2. Tom was what his father had named him. 汤姆是他父亲给他取的名字。

句1的Tom 就是句2的what his father had named him，也就是说：Tom 和what his father had named him 所表示的名字相同。所以，“他给他儿子取的名字和他父亲给他取的名字相同。”