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
As if you really wanted to know
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