Do pets really know their own names?

I voted "yes" but, I think it depends on the individual pet. Some seem to have no response the their name whatsoever. Most of my cats Come running if I call their name in the back yard. I'm not sure if they "know" their name or have just learned a response to it. I think my cat Fluffy knows his name, he is very intelligent. My cat Layla on the other hand, I'm not so sure. She does't come when I call her but that could be on purpose lol.