The melody is called "Hulet's Health" (“Sláinte Bhreagh Huilet” or "a toast to Hulet") in Edward Bunting's 1809 collection of Irish tunes. This “lively bacchanalian composition” (ie: ‘bawdy drinking song’) is generally credited to O'Carolan. The subject, Hewlett, has not been identified. I learned it from Monday night jam list.