Korous

I seek information on the Czech translation of this surname. This is my grandmother’s family name, they immigrated from Bohemia in the 1850’s to the Washington County, Iowa area. Researching my grandmother’s line, Korous. I’ve also seen it as Koroush or Karrousch. Habenicht’s History of Czechs in America does not list this surname nor can I find it in any of Leo Baca’s immigration books. So I’m thinking it translates to another name in Czech but what? Help me if you can. Thank you!