HISTORY OF KENTUCKY, by Lewis Collins, and J.A. & U.P. James, published 
1847.  Reprinted by Henry Clay Press, Lexington, Ky., 1968, p. 227 
[Jefferson county].

The county of Campbell received its name in honor of Colonel JOHN 
CAMPBELL, a native of Ireland.  He came to Kentucky at an early period.  
Having received a grant of four thousand acres of land from the 
commonwealth of Virginia, which was located immediately below, and 
adjoining the grant on which Louisville stands, Col. Campbell became an 
extensive landed proprietor, and a very wealthy man.  He was a member of 
the convention which formed the first constitution of Kentucky, from 
Jefferson county.  During the same year, he was elected one of the 
electors of the senate from Jefferson, and in the electoral college was 
chosen the senator from Jefferson county, in the new State legislature.  
He was a large man, of fine personal appearance, and strong mind, but 
rough in his manners.  He never married, and having died intestate, his 
large estate passed into the hands of many heirs.

Campbell
=
Ireland

http://www.rootsweb.com/~kygenweb/kybiog/jefferson/campbell.j.txt