Can you rename a cat?

[Prudence]

Boris knows when I'm talking about him. He also knows when I'm talking about Sasha, which annoys him, because I should be talking about him. Sasha is about as sharp as a bag of wet mice, so she just hears the blah blah blah ginger. Her name you could easily change. Boris - maybe not. He's had that name for his whole life, since I named him before he was born and his first set of caretakers always called him that for me.