I don't know if it will work for you but all nine of mine know their name and come when called (if they want to!) Whenever we got a new cat I would call their name when they walked into the room. I would excitedly say their name over and over while I went to greet them. I would pet them and love on them at the same time. That way they associated their names with pleasure. I truly make a fool out myself during this time! A cat walks into a room and I act like I have just seen a long lost friend!!
example: Oh PETE! How are you PETE. Oh mama loves PETE. Your my handsome PETE.
Isn't that gross??? I keep that up for as long as they tolerate it and the next time I see them...here we go again!! It's worked for me. Good luck!!
Your kitties are absolutely BEAUTIFUL! whether they learn their names or not!!!