GitHub with multiple repos and usernames on single machine

.gitconfig

~/.gitconfig

[user]
	name = Personal Name
	email = personal@email.com
[includeif "gitdir:~/Projects/Company/"]
	path = Projects/Company/gitconfig-company

config

~/.ssh/config

Host *
  AddKeysToAgent yes
  UseKeychain yes
  IdentityFile ~/.ssh/id_rsa_personal
  
Host github-company
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_company

gitconfig-company

~/Projects/Company/gitconfig-company

[user]
	name = Business Name
	email = business.name@company.com

then instead of

git clone git@github.com:aaa/bbb.git

use

git clone github-company:aaar/bbb.git