We don't have synonyms for fanboy yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are manboy, fanboi and fan boy.
°Someone (normally male) who is utterly devoted to a single subject or hobby, often to the point where it is considered an obsession.
"Apple fanboys have always devoted equal parts of their mind to genuine reasons to praise their chosen corporation, and to blindly ignoring its faults. — Tim Barribeau, The Sydney Morning Herald, December 10 2008."
°Someone (normally male) who is utterly devoted to a single subject or hobby, often to the point where it is considered an obsession.
"Apple fanboys have always devoted equal parts of their mind to genuine reasons to praise their chosen corporation, and to blindly ignoring its faults. — Tim Barribeau, The Sydney Morning Herald, December 10 2008."