William was born in 1670 in Limerick, Ireland, the son of unknown parents.
He has died but the date and place are unknown.
His wife was Sarah Unknown. They were married, but the date and place have not been found. Their three known children were Thomas (1706->1782), William (1702-?) and Timothy (1715-?).
William Dunagan was born in 1670 in Limerick, Ireland and would have been a young man about the time of the siege of Limerick in 1691, possibly a young soldier, fighting against the English and William of Orange. After the Irish defeat in Limerick, the Dunagan family lost everything and many left for the colonies in America soon thereafter.