Here is how to do it;
First create the different config files, one for each folder.

.gitconfig-work

[user]
  email = workEmail@work.com
  name = workName
[core]
  autocrlf = input
[credential]
  helper = store

.gitconfig-private

[user]
  email = privateEmail@private.com
  name = privateName
[core]
  autocrlf = input
[credential]
  helper = store

And now the .gitconfig

[includeIf "gitdir:~/workFolder/"]
path = ~/.gitconfig-work

[includeIf "gitdir:~/privateFolder/"]
path = ~/.gitconfig-private

When you now push to repositories located in privateFolder the name privateName will be used, and for the folder workFolder the name workName is used.

Have you ever wanted to just host your repositories at home instead of handing over everything to some lesser trustworthy third-party site? Then this might be a simple solution for you.

Setup

To create the local hosted git repository.

>cd location_for_the_repository
>git init --bare new_local_hosted_repo.git

This will create a folder ending in .git
Now to use it, navigate to where you want to checkout your working directory

>cd working_directory

and clone the newly created repository

>git clone full_path_to_new_local_hosted_repo.git

The workspace is now ready to use, and you can do all the same things you would normally do, using GitHub, Bitbucket or any other online repository.

A Full example:

>mkdir ~/repositories
>cd ~/repositories
>git init --bare best_game_ever.git
>mkdir ~/workDirectory
>cd ~/workDirectory
>git clone ~/repositories/best_game_ever.git
>cd best_game_ever
>touch ./note.txt
>git add *
>git commit -m "initial commit"
>git push

Note: Remember to backup ~/repositories