Sumer toponym = PIE?

From: Joao S. Lopes
Message: 67108
Date: 2011-01-17

Names of Sumer
Akkadian s^umeru
Sumerian kiengir
Hebraic Shinar
Egyptian Sngr
Hittite S^anHar(a)

Could correspondence s^< ki point to a PIE *k^ sound?
Could correspondence m< ng > nH point to a PIE *ngW(H) sound? or *nHw-?

JS Lopes