Rachel Diggle of Bury ca 1806

Hi,
I would be grateful for information about Rachel dob Mar 15,1806 ( with her twin Mary ), who married ny g.g.grandfather Joseph Fittonin Mar 1838 in Bury. Her parents were listed as Jeremy and Betty Diggle. Jeremy, dob Mar 12, 1780 in Bury was the son of Edward Diggle - no data given.
Since I live in the US , I must rely on LDS databases , free BMD and the help of friends in Lancashire.I can't find any marraige record fo jeremy but I did find one for Jeremiah Djggle and Betty Kay,Dec 13,1801, and the 1841 censuslists only Jeremiah age 60--therefore born 1780-1, surprisingly close to that of Jeremy. Could Jeremiah and Jeremy have been the same person?
It gets stranger, since Rachel named her three children Edward,Betty and Jeremiah, coud this be just a coincidence?
Any info would be welcome. Thanks