Songs by that name are usually forms of The Young and Single Sailor/ The Sailor's Return / A fair maid walking in her garden / The Broken Token etc., which has been found in pretty well every English-speaking country over the years. Allan has just posted one such. Where did it come from?

As Seven Years I Loved a Sailor it's turned up in Scotland and Canada. There are sets in Peacock's Songs of the Newfoundland Outports, for example, and several from various sources in the DT and the Forum here. Number 264 in the Roud Folk Song Index, and N24 in Laws' classification system. It was printed on broadsides during the 19th century as The Young and Single Sailor, The Loyal Sailor and The Sailor's Return; probably other names that I can't think of as well.

I'm afraid that it's way past my bedtime, so that's all from me; but I'm sure that other people will point you toward material available here and elsewhere. There's quite a lot, and probably some tunes.