Rei

Easton's Bible Dictionary (1897)

Friendly, one who maintained true allegiance to king David (1 Kings 1:8) when Adonijah rebelled.

Smith's Bible Dictionary (1863)

(friendly), a person mentioned (in (1 Kings 1:8) only) as having remained firm to David’s cause when Adonijah rebelled. (B.C. 1015.)

Hitchcock's Bible Names Dictionary (1869)

my shepherd; my companion; my friend

Public domain dictionaries.