Scotch Eggs

Are these really Scotch? Where does one find them in the US?

This has always puzzled me, specifically because the only place I have ever seen them is as part of the "traditional" Japanese New Year's meal ("skotchi eggu"). When I had them, they were wrapped in hamburger, not sausage, but otherwise pretty much as described in JP's death-row link.

Western food permeates everyday life in Japan, but not the New Year's meal. It is **VERY** Japanese, and this one item stands out like a sore thumb. My Japanese friends/colleagues have no idea how this came to be included, or even where it comes from.