Probably from uwg; round; Og, a king of Bashan -- Og.
see HEBREW uwg
H5747. Og
עוֺג and (1 Kings 4:19) עֹג proper name, masculine (originally proper name, of divinity, according to RSSem i. 91, 2nd ed, 93); — Og, giant king of Bashan (i. e., peculiarly, of a country, see RSl.c.), usually + סִיחוֺן (q. v.); Numbers 21:33 (JE), 32:33 (P), Deuteronomy 1:4; 3:1, 3, 4, 10, 11, 13; 4:47; 29:6; 31:4; Joshua 2:10; 9:10; 12:4; 13:12, 30, 3 (probably all D), 1 Kings 4:19; Nehemiah 9:22; Psalm 135:11; 136:20; ᵐ5 (Ωγ (Τωγ B Deuteronomy 3:1; 4:47).
עֻגָב עוּגָב, see עגב.