Farm Name Onya_

My ancestor Lars Ånonnsen Moi settled on a small plot of land called Støylsjordet part of the larger Høgeli farm near Åmli in Aust Agder fylke. His father is know to me as Ånon Larssen Onya. Birth date and place unkown. I would assume that Onya is the name of a farm, but I have been unable to find out if this is true or where this farm may be. The best quesses would be in either Vest Agder or Aust Agder. Any information on a farm name such a Onya would be greatly appreciated.