This surname is rather unique on italian telephone directory.
It comes from the area of Naples: the FLEGREE ISLANDS, according to Ellis Island site from SERRARA-FONTANA, a municipality of ISCHIA ISLAND.
The meaning from this surname is not sure: from a name of place?
from the italian given name MATTEO (matthew)? or just from an old nickname?
There are still some MATERO families in USA, especially in North-Eastern states.
See also the Italian surname MATTERI in Lombardy, Northern Italy.
See the Italian White Pages:
www.paginebianche.it
write the surname and "NA" that stands for NAPLES province