I will try to help you when I can in the future. For now I can't am in the middle of a family crisis. However, Here are some tips.
Contact via the Internet the Guam Television Station post your picture and your parents if you have any on the site. it is called.
KUAM.com
Then go to the "familiar faces" on their site where you can post photos and information or request it.
Also the Guam Univesitry has an extensive genealogy site on site. Try to find it in the Internet and contact the genealogy department.
I have to do a lot of research in my papers and files to locate people.
My mother in law's last names were Babauta San Nicolas but not sure if your father is connected to my family at all.
Also it is possible that someone who lived in Rota Island which is an Island near Guam may know your dad. You may also try going to the Chamorro web sites, there are a lot of them, and Islander websites. there you will find information of Islanders from various places and areas to post information.

Please keep me informed.

By the way, my family crisis is that one of my brother's in law just passed away in Guam. He was Vice Mayor of Agat his name was Jesus Babauta Chaco, There will be two funerals for him, one the Religious funeral then a large State Funeral, The Governor of Guam ordered all Flags on the Island to fly Half Staff the day he died.
Check the KUAM.COM and search news of Nov 10 or 11 you'll read about it.
Best of luck to you