how to remove "last name" field

Hi,

I’d like to remove the last name filed that I don’t need it in my country. How to remove it?
I try to access form-edit-account.php file and delete the last name code, the result is although the last name field is removed, but it can’t save it. There is a message “the last name is a required field” when I click save.

Does there anyway to solve this? thank you

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