 The common prefixes "Ó" and "Mac" can be spelled with the prefix as a separate word, yielding "Ó Briain" or "Mac Millan" as well as the anglicized "O'Brien" and "MacMillan" or "Macmillan".Some Chinese surnames use more than one character.In the United States, 1,712 surnames cover 50% of the population, and about 1% of the population has the surname Smith, which is also the most frequent English name and an occupational name ("metal worker"), a contraction, for instance, of blacksmith or other metalsmiths.