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.