Deuteronomy 2:11

Which also were accounted giants, as the Anakims
Because of their bulky size and tall stature; or,

``the Rephaim were they accounted, even they as the Anakims;''

they were reckoned Rephaim, a name for giants in early times, even as the Anakims were; see ( Genesis 14:5 )

but the Moabites called them Emims;
to distinguish them from the Rephaim; so that it seems this name of Emims was not originally their name, but they are called so by a prolepsis, or anticipation, in ( Genesis 14:5 ) since they had it from the Moabites, a people of a later date.