We've been calling the cat 'Lambcat' or 'Lamb' because the neighbourhood nicknamed him that when he was a stray, because he stole someone's leg of lamb (which gives you an idea of what a big cat he is).
My mum came up with Elgin because he's a marbled tabby, and I like that name too. Bro2 calls him His Lordship because he's quite a supercilious-looking beast. We'll probably call him Lord Elgin of Lamb or something.