You can't unlink them KoRno.

The link is permanent. If I understand correctly your account is linked to Facebook correct? If so then it means that the Facebook name will take precedence and it will be displayed by default in your Top Eleven club profile.

Btw I've written about the whole process of account linking in this post here. Check it out so you can be informed about the process if you ever decide to create additional Top 11 accounts.