That surname is usually associated with Burgenland ancestry - German/Hungarian.
Per the Rawlins County history books, Mathias Kogl was born in St. John Austria-Hungary. His wife Magdalena Hautzinger was born in St. Peter Austria-Hungary. They each arrived separately in the US in the 1890s, lived in Denver, CO for some time and married in 1899 in Denver. They returned to the "old country" for a couple of years, but then came back to Denver and then moved to Rawlins County in 1904.
Also, see this family tree - http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&d...