Sorry, Jilliane. The wife of John Leach remains an unsolved mystery. In my own tree, I've got him, thinly sourced, with a wife called Alicia, no last name. I got to him, best I can tell, by following clues wherever they led from a 6th great grandfather named Churchill. Here's what ancestry.com says about how John Leach is related to me:
paternal grandfather of wife of stepson of wife of uncle of husband of 1st cousin 6x removed (which looks like one of those "connected to AJ" trails.)
OK, I think I know maybe how I got to John Leach: I have, on ancestry.com, taken up the practice of always adding the full family whenever I come across "Mayflower Births and Deaths, Vol. 1 and 2" hints. John's son Nehemiah's wife, Mercy Bryant, carries that source. Ditto on Solomon Leach's wife Hannah, whose LNAB is also Leach. There's no Leaches or Bryants on the Mayflower, Fortune, Anne or Little James, so the actual Mayflower connection lies elsewhere. (Ha! Looks like you got me working on it!)
The Leaches, what little I have on them, don't show a Martha's Vineyard connection. They're mosty around Plymouth Colony/County. I have no parents for John, no maiden name for wife Alicia. I have two children listed - no reason to think there's not more, as shown on the Leach-271 profile.
Looking into this little problem prompted me to merge two John Leach profiles in my own tree. But it's not really my bailiwick. Leach-271 seems to be in order, albeit unsourced. I suspect someone took a leap of faith and linked Alice Eddy as his wife. Sometimes those work out, sometimes they don't. IMO, John Leach's wife s/b Alice Unknown. I've read histories on Alice Eddy's husband Benjamin Hatch, a very early settler of Falmouth. Alice (Eddy) Hatch's last child, Zephaniah, was born in 1709. She died in 1710.
John Leach and his wife Alice (Alicia?), according to WikiTree, had 7 children before 1710. So it cannot be the same Alice. Even if her LNAB was Eddy, it's a different Alice Eddy. I see there was a comment on Eddy-79 about this problem last summer, observing that she could not have been married to both men at once, giving birth to both their children over the same span of years. It was not acted on. I'm going to remove Alice Eddy from John Leach and his children. His wife was somebody other than Eddy-79. A quick search didn't turn up any potential John Leach duplicates to shed light on this problem.
Alice Eddy, Eddy-11, on the other hand, is a direct ancestor. That part of the tree was thoroughly researched (before I was born) by my grandfather (& his father & brother) - as was the Churchill ancestry for that matter.