Well, anyone who knows or has been to Shell Island in Llanbedr, Gwynedd and has used the bar onsite may weill have seen the name above the bar MOCHRAS. I understood it, from one of the locals, to be Welsh for Shell Island. I don't know for certain but I liked the name as much as I did the place and that's how mine came about.
Admittedly, due to relocating to South Wales from the Midlands my trips have become rather few and far between but I had many weekends and weeks camping there and loved every minute of it. If only there were jobs around the area for non-Welsh speakers I would move there tomorrow.