The word Catholic was first used by St. Ignatius of Antioch in a letter to Catholics in the City of Smyrna (around 110A.D.).
“Where there is Christ Jesus, there is the Catholic Church”
St. Ignatius of Antioch, Ad Smyrn. 8,2:Apostolic Fathers,II/2,311 *Catechism of the Catholic Church * ref 830, note 307.