Read that if you pre-order you can reserve your name.. anyone know how?

We will be notified how to proceed before open beta to reserve our name. Wait till then.

Are name Reservations a per-server thing? Or is it Game wide?

I would imagine they will only let you reserve one name per account... but I don't know for sure.

Yes just one name.

one name per account between CB and OB.

I don't think anyone asked how many, but I did however ask whether the name will only be taken on the server of your choice or would it be taken from name availability from the entire game (meaning all servers).

So is our name something unique for our server or for all servers? :3

I'm pretty sure it will be one unique name server-wise.