Sweet William/The Sailor Boy (Roud 273). The earliest I have appears to be the Goggin of Limerick starting 'It was early in spring' of about 1780 but there seems to have been a variety of versions by c1800. Here's a summary of broadside versions I have access to.

The Sailor Boy/The Sailing Trade usually with 9 sts later 8, fl 'The sailing trade is a weary life/trade', Robertson printed it in 1801 and there is a version in Ashton's 'Real Sailor Songs' p63, Johnston, Falkirk also printed it about the same time. In 1817 Hutchinson of Glasgow.

The Sailor Boy, Goggin, with 7 sts 'It was early in Spring' Brereton's you have and then a 9 sts version with no imprint 'The Constant Lover and her Salior Boy' 'Early early all in the spring' (Irish)

Sailor Boy/ The Maid's Lament for her Sailor Boy fl, 'Down by a chrystal riverside' 7 sts as you have it, printed by Evans, Pitts and Catnach.

Then the later Harkness which you have with 8 sts.

I'll check the Goggin but I think you have versions of all the others.