Hi, This was an old post, but I (and my sister) are researching Keffers. Our grandfather is Leroy Keffer of Cumru Twsp. I have read that our family also traces back to this "Mathies Kaffer" and other spellings. I also see a ref. to the Lydia arriving in 1740. The manifest shows a signature of Mathies Kafer.
There are so many generations and children we are trying to sort everyone out. There is alot of reading and research already done it appears-lucky for us!
Just wanted to let you know that there are still Keffers in Cumru!