刚从树上找到的:
Jack:起源于john this is now a well-known independent name.
It was so common in the Middle Ages that it became a synonym for a man,and most of the popular uses of the word are derived from this.
Jax没有听说过,应该不是地道的英文名
Jack就很好Jack Lin
jack杰克
jim吉姆
林子杰:Jay
中国人的英文名.
不是刚刚就说过吗?