Here's some startup info, taken from a British John McCormack Society site:
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Savourneen Deelish (My Sweet Love)(Words attrib. George Colman/Old Irish Air: "Sa mhuirnin dilis," O Dear Love)
Lx 2133[-1], -2 (1907)
Notes: Credits above are given after Nichlolas Carolan, who idendifies Colman (1762-1836) as a playwright who wrote "The Surrender of Calais," in which the verses appeared.
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You can take it Nicholas is correct!

Regards