Namdar is found sleeping south from the Tribal Shrine, across the fallen tree bridge, and past where you get ambushed. He needs a health potion to wake up.

You can mind read him for 400 exp to see what item he needs to wake up.

The bug with the sleeping trio (Namdar, Furley, and Nightwinkle) should be fixed.

Afterwards, the trio can be found in Broken Valley village, near the chapel.