Actually, there are 2 things to hink about...

1. If you want the taran OFFICIALLY registered in the STA's registry (Scottish Tartan Authority), you have to get the approval of Brian Wilton, the STA's director. He will approve both the name and the tartan itself. If he says no, then you'll have to change the name to something else and get his approval. He's very nice and very easy to work with to help come up with name.

2. Just b/c you CREATE a tartan doesn't mean you HAVE to have it registered. You CAN create a tatan and call it whatever you want (as long as you don't call it something that's copyrighted... I.E. the "Walmart tartan" or "Burger King Tartan" or something) and have it copyrighted. It won't be in the official STA Registry, but it wil exist and if you have enough people like it / buy it, it may eventually get in by the simple nature of how common it is.