Characters in the works of Harry Turtledove named Wilbur include:

Wilbur (Days of Infamy), a US Army soldier and minor character in Days of Infamy (novel).
Wilbur (Iron Heart), fictional reporter, minor character in The Man With the Iron Heart.
Wilbur Armitage, a librarian in "Interlibrary Loan"
Wilbur Pease, fictional Captain in the CS Army, minor character in Settling Accounts: The Grapple.
Wilbur Wright of the Wright Brothers, historical airplane pioneer referenced in Colonization: Second Contact and The Great War: American Front.