I found him in the 1880 census (as Yaugh-- this surname is misspelled a LOT in census records):
Pennsylvania > Butler > Petrolia > District 61
It indicates his birth place as Wuerttenberg, which was largely Protestant.
This name -- both Caspar and Jauch/Yauch -- is common in a town I'm researching -- Schwenningen. And many Jauchs were blacksmiths. And in fact, there is a Caspar Jauch ("J" pronounced like a "Y" which is why it was frequently changed so after emigrating to the U.S.), born October 14, 1841. And the church records in Schwenningen indicated he emigrated about 1855.
This sounds like quite a possibility for your friend's ggson. If so, I have his ancestry back to the 1600s. See:
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&d...(Where you see last names in ALL CAPS, those are direct-line ancestors of mine, and where the ggson and I have common ancestry-- i.e., we're distant cousins.)
Not likely Jewish, however.
-- Jillaine Smith
http://freepages.genealogy.rootsweb.com/~jillaine