pison

from Easton's 1897 Bible Dictionary
Pison
Babylonian, the current, broad-flowing, one of the "four heads"
into which the river which watered the garden of Eden was
divided (Gen. 2:11). Some identify it with the modern Phasis,
others with the Halys, others the Jorak or Acampis, others the
Jaab, the Indus, the Ganges, etc.
    
from Hitchcock's Bible Names Dictionary (late 1800's)
Pison, changing; extension of the mouth
    

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