It happened after this, that there arose war at Gezer with the Philistines: then Sibbecai the Hushathite killed Sippai, of the sons of the giant; and they were subdued.
There was not merely one Goliath (or giant); there was an entire family of them; and there is no reason whatever to question the accuracy of what the Chronicler has written here.  (See my comments further on the Giants of Gath in my commentary on 2Samuel, pp. 302-303.)  Critical objections to the Chronicler's report here are grounded in their prior hatred of the witness borne in the Chronicles to the authenticity of the Books of Moses.  The Chronicler did not "create" this record of several giants; he merely reported the truth.