w/ apology for the cut paste, here is someone who made the observation:

1916        Sharp, Cecil J., A.G. Gilchrist, Lucy E. Broadwood, Frank Kidson, and Harry E. Piggott. "Sailors' Chanties." Journal of the Folk-Song Society 5(20):297-315.

"This is apparently the opening phrase of a variant of the tune made famous by Tom Moore's arrangement as " The Song of Fionnuala" (" Silent, oh Moyle "). Moore took his air from Holden's Irish Tunes, where it appears as " Arah, my dear Evleen." Holden's version is spoilt by its sharpened seventh; Moore retained this, and Sir Charles Stanford has changed it to what he believes to be the old form (see below). The Irish tune " Savourneen Deelish " (used by Moore for his song "'Tis gone, gone for ever," and by Thomas Campbell for his poem " There came
to the beach a poor exile of Erin "), seems allied to " Arah, my dear Evleen." The opening phrases of the songs are given here for comparison, and very interesting notes on them are in Moffat and Kidson's Minslrelsy of Ireland, pp. 224, 262, and Appendix, p. 341. -L. E. B. "