No researcher for William James Warnock has been able to answer this question. Descendants from two generations traveled to Ireland with high hopes, but were unsuccessful. All Warnocks are thought desended from a common ancestor named Mhearnog (which, I am told, is pronounced "Warnock) who lived in Scotland c. 550-600 . A time-line which purports to give the history of the Warnocks from the earliest known record, states that "Brothers John, James & William Warnock migrated from Scotland to northern Ireland to work as tenant farmers under James Hamilton". It has been speculated that both the the County Down & Tyrone Warnocks descended from them, but though William of Down has been traced to Scotland, no such documentation has been found .for William of Tyrone.