It was common for married women to use their maiden names particularly when travelling without their husbands.
Possible ship manifest for Giuseppe Croce
Moltke, out of Naples, arrived NY 4 Sep 1906
Giuseppe Croce, yob about 1882, male,
single
Last residence, looks like Campli
Desitnation Philadelphia PA
Having trouble with imageshack this AM so I've linked the Ellis Island site record.
http://www.ellisisland.org/search/shipm ... 0142100051
The above might be your ggrandfather if he came to the states unmarried, returned to Italy, was married and then came back. If that's the case, we need to locate another manifest.
In relooking at Francesca and Premo's manifest, their last residence appears to be Campli, and the birth town at second look could be Teramo in the same province as Campli. Need a second or third set of eyes to make sure I'm not seeing things.