RenameUtil

# RenameUtil
# cwisbg.com
from pymel.core import *
sl = selected()
for s in sl:
    objType = s.getShape().type()
    if objType == "mesh" and s[:4] != "geo_":
        print "Renaming ",s," to:","geo_"+s.split("|")[-1]
        newName = "geo_"+s.split("|")[-1]
        rename(s, newName)