git user.name has multiple values

warning: user.name has multiple values
error: cannot overwrite multiple values with a single value
       Use a regexp, --add or --set-all to change user.name.
[user@fc ~]$

[user@fc ~]$ cat ~/.gitconfig
remove the name here.

Add the new name in /etc/bashrc
[user@fc ~]$ vi /etc/bashrc
git config --global user.name "Firstname lastname"

[user@fc ~]$

Refer:

http://stackoverflow.com/questions/4310974/more-than-one-value-for-the-key-user-name-git

https://git-scm.com/book/en/v2/Getting-Started-First-Time-Git-Setup


To set email, use
$ git config --global user.email  "youname@yours.com"

To verify the results, use 

$ git config -l