'Certain' in the Bible

So Jesus came again into Cana of Galilee, where he made the water wine. And there was a certain nobleman, whose son was sick at Capernaum.

For an angel went down at a certain season into the pool, and troubled the water: whosoever then first after the troubling of the water stepped in was made whole of whatsoever disease he had.

And a certain man was there, which had an infirmity thirty and eight years.

Now a certain man was sick, named Lazarus, of Bethany, the town of Mary and her sister Martha.

And there were certain Greeks among them that came up to worship at the feast: