Bible dictionaries
Rei
What Bible dictionaries say about “Rei”, one article after the other.
Easton’s Bible Dictionary & Webster’s 1828 Dictionary
Rei - (Easton's Bible Dictionary)
Friendly, one who maintained true allegiance to king David (1 Kings 1:8) when Adonijah rebelled.
Matthew George Easton, Easton’s Bible Dictionary; Noah Webster, American Dictionary of the English Language (1828)
The article in Easton + Webster 1828International Standard Bible Encyclopedia (ISBE 1915)
re'-i (re`i, "friendly"; Rhesei): Rei, Shimei and the Gibborim who belonged to David are listed among those who did not join Adonijah in his attempt on the throne (1Ki 1:8). The name is very uncertain. Winckler (Geschichte, II, 247) identifies him with Ira, the Jairite, who was a "priest to David" (2Sa 20:26 the Revised Version margin); he tries to prove that this Ira (or Jair) was a priest of Bethlehem. Stade (GVI, I, 293, note 1) holds that Shimei and Rei were two officers of David's bodyguard. Josephus (Ant., VII, xiv, 4) has ho Daouidou philos, thus making Shimei a "friend," the courtier of 2Sa 15:37; 16:16, and omitting Rei entirely. This would call for an original reading re`h ha-melekh, or re`eh ha-melekh, and is too wide a variant from the Massoretic Text. Assuming that Rei belongs in the text, it is safe to conjecture that he was an officer of the royal guard.
Horace J. Wolf
International Standard Bible Encyclopedia — James Orr, general editor and contributors; CrossWire SWORD module ISBE 2.2
The article in ISBE 1915Smith’s Bible Dictionary
William Smith; revised by F. N. Peloubet and M. A. Peloubet; CrossWire SWORD module Smith 1.3
The article in Smith