I have a large family tree on the Ivans family. I have found the names spelled all three ways.
My grandmother was Maude Amanda Ivans, or Ivins.
Her father was Thomas Ivans born 1812 Union County NJ
Married 18 apr 1850 Marshalltown Marshall Co IA
Electa Maria Cummins born 1830 PA
Mary J. Ivans born 1852 Indiana
John S. Ivans born 1853 In
Eleazer William Ivans born 1855 visited W.C.Julian in Belleville KS (his brother in law) Dec 6 1923. living in Des Moine IA at the time.
Maude Amanda Ivans Born 9 Jan 1856 Warsaw Kisciusko Co In
Married W.C. Julian 2 April 1876 Marshalltown IA
Napoleon B. Ivans born Oct 1860 In Mrd Elizabeth Van Riper
Hellewey C. Ivans born 1866 AKA Church
Church lived in Scandia KS in 1932.Lots of Ivins info