One way to get more information regarding your grandparents would be to send of a request form to Ottawa for their naturalization records.If they are alive, they can help you.If they have past on you can do the below.
For instance, my grandfather past away in 1961.I photographed his tombstone (a death certificate will do if you have one) and filled out a request form that you can usually get at your local library. Check out the Canadian National Archives website for a better explanation.I think the website is www.archives.ca???I asked for my grandfather's passenger ship records and his naturalization (citizenship papers) records.They revealed quite a bit of information as well as how his name was spelled at that time.I believe the record search costs $5.00.
Now the problem is the way the Canadian Government changed their names when they came over here.That I can't help you with.
There is a guy on www.infoukes.com that has a book that lists all the military and civilian casualties from WWII.I suggest you post your message on this website stating you are researching the name PONTO, where your grandparents are from and does anyone recognize the name.You could even ask the guy, Alan SZUCH, to look up in his book.It helped me find family in Edmonton we never knew we had.They spell our name FORFYLOW while we spell it FORFELLOW.The only reason I found them was because of Alan.
Rather than continue to beak off on this site, you can email me at firstname.lastname@example.org.