This is an article from the public domain Easton's Bible Dictionary, originally published in 1897.
This article is written from a nineteenth century Christian viewpoint, and may not reflect modern opinions or recent discoveries in Biblical scholarship.
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Rephaim - lofty men; giants, (Gen. 14:5; 2 Sam. 21:16, 18, marg. A.V.,
Rapha, marg. R.V., Raphah; Deut. 3:13, R.V.; A.V., "giants").
The aborigines of Palestine, afterwards conquered and
dispossessed by the Canaanite tribes, are classed under this
general title. They were known to the Moabites as Emim, i.e.,
"fearful", (Deut. 2:11), and to the Ammonites as Zamzummim. Some
of them found refuge among the Philistines, and were still
existing in the days of David. We know nothing of their origin.
They were not necessarily connected with the "giants" (R.V.,
"Nephilim") of Gen. 6:4. (See Giants[?].)
From Easton's Bible Dictionary (1897)