Hello Everyone,
Orrire is very right but there is also a short-cut for the nicknames which do not contain any space in it.
Like if you want to un-ignore a player named GMOrrire you can type /unignore GMOrrire without quotations
but however if the player's name is GM Orrire then you have to type /unignore "GM Orrire" inside quotations.
This is not a very short-cut however it saves the time of holding the Shift key and then the quotes
Thanks and Best Regards,
Pr0Ankit