It seems your ELHORIC will be certainly Elhoten = Chodska Lhota in Domazlice district in southwest Bohemia. There lived and still are living families Kveton and probably also Mares there. Kveton from Chodska Lhota is distant relative to my wife.
The emigration to USA before 1850 is unprobable. I mean it can be first on 1852.
All the best.Tony.