'Certain' 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:

But certain worthless fellows said, "How shall this man save us?" They despised him, and brought him no present. But he held his peace.

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