The spelling could be 'Kishmul's' with an 'h' - that seems to be more common, and is the spelling on Danny's album. However, I took my spelling 'Kismul's' from Peter Kennedy's note to 'The Misty Mountain', a related song, in his 'Folksongs of Britain & Ireland' p53. He also gives a reference to Kennedy Fraser 1909, Vol 1, p80 with that spelling.

--Stewie.