Leave it to Nick Gombash of Hungary Exchange to trace Lady Gaga's roots - especially since she has both Sicilian & German roots! Lady Gaga was born Stefani Germanotta and whose parents both shared Italian ancestry.
Lady Gaga's paternal grandfather was Joseph Anthony Germanotta. He was born to Italian immigrants from Naso, Messina, Sicily..I could say more but I'll let Nick tell you. To read more visit Nick Gombash's Genealogy Blog - which by the way was voted by Family Tree Magazine as one of the top 40 Blogs in 2012. His post titled The Family Tree of Lady Gaga includes a detailed family tree chart of Gaga's ancestry.