Apparently for yshiymown; desert; Shimon, an Israelite -- Shimon.
see HEBREW yshiymown
H7889. Shimon
שִׁימוֺן proper name, masculine in Judah, 1 Chronicles 4:20, Σεμ(ε)ιων, Σαμι.
שׁין (√ of following; compare Assyrian šînu, Iphte. istîn, urinate; šînâti (plural), urine; verb also Ethiopic Aramaic , ; see Arabic bladder (Wahrm)).