Tom, Dick and Harry
The phrase "Tom, Dick and Harry" is a placeholder for unspecified people. The phrase most commonly occurs as "every Tom, Dick and Harry", meaning everyone, and "any Tom, Dick or Harry", meaning anyone, although Brewer's Dictionary of Phrase and Fable defines the term to specify "a set of nobodies; persons of no note".
Similar expressions exist in other languages of the world, using commonly used first or last names. The phrase is used in numerous works of fiction.