What do you mean by my last name and your last name?

"Take my last name and give me your first name" means to marry you. Generally speaking, a wife is called by her husband's surname. If her husband's surname is Chen, others will call her Mrs. Chen.

In ancient times, women took their husbands' surnames after marriage. "Take your surname in my name" should mean that (women) want to marry you. Proposing marriage is a very literary way now. When proposing marriage: male (it should be said): in the name of my surname; Woman (I should say): It's named after my family name.

Reasons why ancient women took their husbands' surnames after marriage.

Influenced by the thought of "three obedience and four virtues", ancient women paid attention to "following their father at home and marrying their husbands". Marry your husband's family, that's his family. If the woman's surname is Wang and the husband's surname is Zhang, even after death, the word "Zhang" will be engraved on the tombstone.

In ancient times, women had no formal names, only surnames. In this way, when they married their in-laws, they took their surnames and added their surnames, such as Zhang and Li. After marriage, they are called Zhang Li. After marriage, they have a formal name, Zhang Li. This is the case in Hongkong, Taiwan Province Province and many developed countries. Taiwan Province Province is the heritage of China, just look at the genealogy.