The "Grand hornpipe" recorded by Liza Carthy was only recently called that. The Welsh name quoted earlier in this thread may well have the original name. The only reason it is called "The Grand Hornpipe" is because it comes originally from Henry Stables, the Langdale fiddler, and he referred to it is "A grand hornpipe". A description, not a name. And a very good description, too. The intrusive"The" first appeared in Jamie Knowles' book "The Northern Lass" He copied the hornpipe out of my notebook (where it is labelled "A grand hornpipe") and added the "The" for his publication. Not that this is much to do with Welsh dance tunes!