My last name is Zhan or Zhan.

The surname Zhan has a history of 2800 years. Jen's is a descendant. You should feel very honored!

The words "war" and "war" are really different. Semantically, "Zhan" means divination, and its original meaning is multi-character. Judging from surnames, they are two surnames with the same sound and different sources. In the ancient Zhou Dynasty, there was a country called Zhan, and its monarch was named Hou, which was called Zhan Hou in history (Zhan Hou was his son and Zhan surname was given to him). Hou can follow Gong from generation to generation and be an official in the court from generation to generation. Therefore, the Zhan family is very prosperous, and future generations will take the country as their surname and pass it on from generation to generation. Illiterates mistakenly believe that Zhan is a simplified word, so they change it to Zhan's, which is the disadvantage brought by the current society's random writing of irregular words.

It's all the fault of simplified characters. You can change your original surname, hehe, but the current "Zhan" surname is also a legal surname.