Hi June,
I don't think I can help much but my Tiffins were from Cumberland as well. Unfortunately I only know about four generations in England going back to about 1730 as my GGrandfather immigrated to Canada in 1858. Both he and his father William were born at the famous farm Moorland Close near Brigham and Cockermouth. His grandfather Joseph was born at Brigham but where Joseph's father Isaac was born is unknown. I know what you mean about repetitive names as we have loads of Johns, Josephs, Williams, Reubens, etc. Unfortunately there is little hope of my ever being able to do any in depth research in local records as I am too far away. You are welcome to have a look at my web site if you think any of the information might help.
http://www3.telus.net/jtiffingenealogy/