'Certain Man' in the Bible

Now there was a certain man of Ramathaim-zophim, of the hill-country of Ephraim, and his name was Elkanah, the son of Jeroham, the son of Elihu, the son of Tohu, the son of Zuph, an Ephraimite:

Now a certain man of the servants of Saul was there that day, detained before Jehovah; and his name was Doeg the Edomite, the chiefest of the herdsmen that belonged to Saul.