git error: More than one value for the key user.name: code example

Example 1: git error: More than one value for the key user.name:

$ sudo git config --global --unset user.name "username"

Example 2: git global username --replace-all

git config --global --replace-all user.name "Your New Name"
git config --global --replace-all user.email "Your new email"

OR

git config --global --unset user.name
git config --global --unset user.email