There can be a lot done if you are not so particular about who gets credit for it.

Freeman (?–1886) U. Representative from Mississippi
John Ripley Freeman (1855–1932) American civil engineer
Buck Freeman (1871–1949) baseball player late 19th and early 20th century
Jack Freeman (American football) (1918–2003) American college football coach
A one-time pseudonym for George Orwell in the essay "Can Socialists Be Happy?"
John Freeman brother of Gordon Freeman in the infamous Half-Life fanfiction Half-Life: Full Life Consequences.