Deuteronomy 2:11
Ver. 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 Ge 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 Ge 14:5 since they had it from the Moabites, a people of a later date.