Nigel Mattison's birth name is Nigel James Mattison.
Mr.Campbell
Nigel Lythgoe goes by Nasty Nigel.
Nigel is not a character from the books. But there is Nigel in the movies (Gof, OOTP). He is Potter's fans, Harry is Nigel's idol.
Nino Bellini's birth name is Giovanni Bellin.
Shyne's birth name is Jamal Barrow.
Nigel Benn's birth name is Nigel Gregory Benn.
Nigel Planer's birth name is Nigel George Planer.
Nigel Tangye's birth name is Nigel Trevithick Tangye.
Nigel Patrick's birth name is Nigel Dennis Wemyss.
Nigel Davenport's birth name is Arthur Nigel Davenport.
Nigel Kneale's birth name is Thomas Nigel Kneale.
Nigel Lovell's birth name is Nigel Tasman Lovell.
Nigel Mansell's birth name is Nigel Ernest Mansell.
Nigel Marven's birth name is Nigel Alan Marven.
Nigel Farrell's birth name is Nigel George Farrell.
Nigel Hamilton's birth name is Charles Nigel Hamilton.
Nigel Havers's birth name is Nigel Allan Havers.