Hi Randy,
Sorry, no, our Wilhelm Ewert (b 20 Sep 1854, Germany) is not the one you're searching for. Our's married Friedericke A Euscher (b 9 Oct 1859, Germany). To my knowledge, there has been no spelling change of the surname in any of our Wilhelm Ewert's descendants. Our Wilhelm did have a daughter known as Mary (b 14 Oct 1890), but she married Hermann Frederick Bargmann (b 20 May 1891, Herkimer, Marshall, Kansas).