Totally anecdotal evidence, but I have two cats and I give them "wet" food once a day. If one of them is far from the food bowls I say his name and he immediate

Totally anecdotal evidence, but I have two cats and I give them "wet" food once a day. If one of them is far from the food bowls I say his name and he immediately comes running. If none is near me, both come running as soon as I call the first name (from different parts of the house). So, non-scientific, but I always assumed they could recognise each other's name.