You cannot determine if a last name is Italian based solely on the name itself without specific knowledge of its origin. While many surnames are distinctly Italian (e.g., Rossi, Ferrari, Esposito), others are shared across ethnicities due to migration, historical borders, or linguistic similarities. Names that sound Italian may actually be Spanish, Portuguese, French, or even Jewish in origin. Additionally, spelling variations over centuries can obscure true roots. Genealogical research, family records, and DNA testing are the most reliable ways to trace a surname's ethnic origin.