My immigrant ancestor Rev. Johannes Conrad Wirz came from Zurich, Switzerland, arriving in Philadelphia on May 29th 1935. I have a database of (so far) known descendants on my web site, most of whom used the Wurts (with an "s") spelling, although some changed it to Wirts or Werts. A number of public records in NJ, NY, and some PA, have family members recorded as Wurtz, although they were apparently known to their family as Wurts (???). Some of the descendants settled in Fayette Co., PA, and later Greenup and surrounding counties in KY (Boyd, Lawrence and Carter Co.).
The History of Greenup Co., KY, co-authored by Nina Mitchell Biggs erroneously lists Wurtemburg, Germany as the origin of the Wurts brothers, who were actually great-grandson's of J. C. Wirz mentioned above.
Also on my site is an account of the journey from Switzerland as printed in articles published by the Pennsylvania-German Society.