Re Digby's Farewell of which the modern day version is Roud 466, Laws K17 'The Lover's lament for her Sailor': at the prompting of posts above I looked at the chorus and format. Both songs have the same rhythm and rhyme scheme and....well, here is the first verse and the chorus just for comparison...look carefully at the chorus!

As I was a walking down by the sea shore,
The winds and the waves and the billows did roar,
I heard a shrill voice make a sorrowful sound,
'Twas the wind and the waves and the waters around.

Crying 'Oh my love's gone, he's the lad I adore,
And I never, no never shall see him no more.

Whilst the tunes are pretty different the last line of the chorus certainly sounds the same in some versions.

Both songs date back to the 17th century and one could easily have influenced the other during those centuries in between.