'Certain' in the Bible

And he came to a certain place and stayed overnight there because the sun had set. Taking one of the stones of the place, he put it under his head and lay down there [to sleep].

Now a certain man found Joseph, and saw that he was wandering around and had lost his way in the field; so the man asked him, “What are you looking for?”

Now at that time, Judah left his brothers and went down to [stay with] a certain Adullamite named Hirah.