Genealogy /
Last Name: DOWGIALLO from Poland [44]
but could it be that Dowgiallo is a Jewish name, or might there be a Jewish branch of the Dowgiallo family?
It seems that (some) Jewish people had this name or a variation of it... is the best answer I can give you.
This is the reason I asked for a Christian/first name.
The Ship's Manifest sometimes shows next of kin. This might have the original spelling of the name. Remember, the ship's manifest was written at port of departure and may be slightly different to arrival records. It all depends on the language spoken by those filling in the documents and the language spoken by the person giving the information.
If the name has been changed it is easy to assume that it happened at Ellis Island. But this is not always the case.
The Social Security Death Index might show his place of birth. (you don't have to pay for this info)
Naturalization Records can show quite a bit of information.
If G-Grandfather served in the US military at any time you may find that these records show something.