Heidy definatly does know her name, but really responds to "Dee Dee" or "Deeee" as thats what I mostly call her, if I do call her Heidy usually its when she isnt paying attention or is being naughty, and then she she is where I wanna her to be quick as a flash, lol.
Monty knows his name and will pretty much always come to you, or if not will prick his ears toward you and look at you, its sooo very cute. I think he thinks he is the royal man of the house, lol. He proved he really does though once, as when we lost him and the people who found him, found out his name from the posters, they said he had a look on his face of a mixture like "Uh oh, I am gonna be in soo much trouble" and "how'd you know?.
Ozkar kinda knows his name, but responds more to Ozzy, but since they sound the same I can't really tell, however, being the very talkative cat, he always answers with a meow.
Sable knows her name, but tends to ignore me alot now, since she is grown up and there is too much fun to be had to pay attention to mummy! lol. Sometimes she will come if she is really sooky, or if its dinner time, and others she will aknowledge you with a prick of the ears.