From BiblePortal Wikipedia

Hastings' Dictionary of the Bible [1]

SHOBI . According to   2 Samuel 17:27 , a son of Nahash the king of Ammon, who, with Machir of Lo-debar, showed kindness to David when he fled to Mahanaim at the time of Absalom’s rebellion. There is some doubt about the name, however, as in   1 Chronicles 19:1 f. the son of Nahash who succeeded him was Hanun. S. A. Cook ( AJSL xvi. 164) suggests that the text of   2 Samuel 17:27 is corrupt, and that it originally read ‘and Nahash came,’ instead of ‘Shobi, son of Nahash.’ The very existence of Shobi seems, therefore, uncertain. If, however, the present text of Samuel is sound, it is a better historical authority than Chronicles.

George A. Barton.

Smith's Bible Dictionary [2]

Sho'bi. (Glorious). Son of Nahash, of Rabbah, of the children of Ammon.  2 Samuel 17:27. He was one of the first to meet David, at Mahanaim on his flight from Absalom. (B.C. 1023).

Morrish Bible Dictionary [3]

Son of Nahash of Rabbah, of the children of Ammon: he sent succour to David when he fled from Absalom.  2 Samuel 17:27 .

Fausset's Bible Dictionary [4]

Son of NAHASH ( 2 Samuel 17:27). Showed hospitality to David when fleeing from Absalom.

Holman Bible Dictionary [5]

 2 Samuel 17:27

Easton's Bible Dictionary [6]

 2 Samuel 17:27

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [7]

(Heb. Shobi', שֹׁבַי , probably another form for Shobai [q.v.]; Sept. Οὐεσβί ; Vulg. Seb ) , a son of Nahash of Rabbah of the children of Ammon ( 2 Samuel 17:27), and one of the first to meet David at Mahanaim on his flight from Absalom, and to offer him the hospitality of a powerful and wealthy chief, for he was. the son of David's old friend Nahash; and the bond between them was strong enough to survive, on the one hand, the insults of Hanun (who was probably his brother), and, on the other, the conquest, and destruction of, Rabbah. B.C. 1023. Josephus calls him Siphar ( Σιφάρ ), "chief ( Δυνάστης ) of the Ammoanitish country" ( Ant. 7, 9, 8).

International Standard Bible Encyclopedia [8]

shō´bı̄ ( שׁבי , shōbhı̄  ; Οὐσβεί , Ouesbeı́ ): One of those who remained faithful to David during the rebellion of Absalom (  2 Samuel 17:27 ).