There's a wonderful unaccompanied version by Séamus McCardle on the very rare 1974 album, Merrily Kissed the Quaker, by The Blacksmiths (who also featured a young Paddy Keenan on pipes). McCardle, too, sang "clúracán". I don't know if it was originally "clúracán" and got changed to "leprechaun", as it was better known, or if was originally "leprechaun" and somebody changed it to the lesser-known "clúracán", perhaps to be different, or to show off wider mythological knowledge. Either way, I sing it how I first heard it sung by Séamus McCardle.