Though Smith is the most common last name in the United States and the United Kingdom, fewer than 5 million people worldwide bear the name (it ranks far behind the name Li, held by 108 million people). But you might be a Smith and not even know it. These surnames are based on various languages’ words for the metalworking profession:

De Smet: Dutch
Ferraro: Italian
Haddad: Arabic
Herrera: Spanish
Kovacs: Hungarian
Kovalenko: Ukrainian
Kovalev: Russian
Kowal: Polish
Lefèvre: French
Lohar: Punjabi
Schmieder: Yiddish
Sedaris: Greek