Do dolphins have names for each other? Well, a study run by Stephanie King between 1988 and 2004 was there to see if dolphins really did call each by name.
179 pairs of wild bottle nose dolphins off the coast of Florida where monitored on and it turns out ten of them had copied one pf the dolphins signature whistle, these sounds where what they used to identify one another. These clever dolphins only imitate the whistle of the other dolphin if they are separated or apart and respond with the same sound.
Some of the dolphins may just be copying the whistles because they hear them a lot or because they are calling each other. No other animal can copy whistles of each other but parrots may be able to.
Here is a link to an article in more detail about these dolphins. And here
