The Professor is Digory Kirke. He is also the little boy Digory from The Magicians Nephew.
There are, you could argue, two main characters in the book: Digory Kirke and Polly Plummer. Digory is in more of the book than Polly though. Also since it's called "the magicians nephew" and Digory is the magicians nephew he is a bit more of a main character than Polly.
Kirke Lucas is 6'.
Kirke Mechem was born in 1925.
Ian Kirke was born in 1980.
David Kirke died in 1654.
Digory Kirke was created in 1950.
Arnold Kirke-Smith died in 1927.
Arnold Kirke-Smith was born in 1850.
Harry Kirke Wolfe was born in 1858.
Harry Kirke Wolfe died in 1918.
Henry Kirke White was born in 1785.