Git config global file - remove settings

The following command.

$git config --global --list

gives me.

user.name=test user
user.name=gotqn

I'd like to remove my first name I referred to this article and have done the following commands but without any result.

git config --global --remove-section user.name='test user'
git config --global --remove-section user.name="test user"
git config --global --remove-section user.name=test user
git config --global --remove-section user.name
git config --global --remove-section test user

I am using Ubuntu 12.04 and

git version

gives me

git version 1.7.9.5

Please, help on this, because i want to try to save my project using git, but do not want to exec the command with 'test user' name.

You can edit the ~/.gitconfig file in your home folder. This is where all --global settings are saved.