Patronymically from Shim'own; a Shimonite (collectively) or descendants of Shimon -- tribe of Simeon, Simeonites.
see HEBREW Shim'own
H8099. Shimoni
שִׁמְעוֺנִי adjective, of a people with article as collective noun, Numbers 25:14; 26:14; 1 Chronicles 27:16; הַשּׁ ׳מַטֵּה Joshua 21:4.