The Island of Hitra

Recently, my family celebrated the centenial of our immingrant great granfather who came to the US and settled. I'm not certain of his real name, but my families last name is Ulvog. Hatland and Hanson are also names of relations. As well, I know my family originated from the island of Hitra (I hope I spelled it right). I have also found a settlement listed as "Ulvog" on the island. I am fifth generation Norse/American. I am curious about my heritage. My grandparents have only been able to give me limited information of our families trades. However, they have told me that through the centuries my family were blacksmiths. I would be deeply appreciative of any information leading to finding my roots. Thanx. Rob U