I talk to all my fish and they all have names. In fact, one of my Oscars, "Clyde" has learned to mimic our mouth movement when we say hello and he sais hello back.
Yes, the more you talk to your fish, the more they respond.
Our dog face puffer defenitely talks to us, responds in joy to our voice by fluttering his pectoral fins and he talks to us to let us know what he wants. Communication is clear and obvious.
I think fish are smater than people realize and the more you talk to them, the more they learn.