What kind of names?
For my Husband, it was a hand sign. A lot of the chimps at Central Washington State Univ. CHCI knew and used sign language and taught it to other chimps. No, I am NOT joking. One Mother taught it to her adopted baby (she lost her own, the baby's name is Loulis). Washoe is her name, she is about 40 or so now. Anyway, My husband would walk around the enclosure and it is COLD in Ellensburg in the winter. So he would put his hands up to his mouth and blow on them to warm them. So his name to the chimps was to bring up both hands to the mouth and blow on them as if to warm them. If he was not there for some reason they would ask, using sign language where he was, using the hand blowing gesture to represent him.
Chimps are VERY intelligent creatures. To understimate them is to make a grave error.