It's common knowledge and it seems I've always known the main character's name in A Connecticut Yankee is Hank Morgan. I, however, have been unable to find that name occurring anywhere in the on-line editions I have of this book - Gutenberg Project. I've been doing string searches on the text versions I have but the only Morgan it finds is Morgan le Fay. I Know it's his name but I don't recall how I know this, but Wikipedia tells me it's so.