If you're still out there, the Aleys in this family appear to be from Germany, though they could be from England or Ireland. If I recall, the Michael Aley that is the likely father of John Aley (b. ca. 1795) was from Germany originally, and I know that there are Aleys in the German phone book today. I am sorry that I do not have more information about Michael, but my great-grandaunt married Audrey Aley (male) in 1923, so I have been researching this family lately.
In German, the name is pronounced Ah-LAY, though I guess in English it's AY-lee.