My GrGrandfather, William Eiler was born in Iowa in 1888. Census records for1925 List his parents as JR Eiler and Helen Marie Schmit (spelling?) with both his parents being born in Germany. In more searching I found JR is Jerry R and Helen aka Raina, Rina, Reina.
Have you been able to find anymore on your Eiler? I would love more on mine.