I'm sorry for your loss and empathize with the sadness. I lost one of my two cats a year and a half ago due to liver cancer. He also sat and did nothing for long periods, couldn't eat and would sometimes "cry". I had to have him euthanized.

I had him and my other cat for about 12 years, since both were kittens.

Their names are #1 (deceased) and #2 respectively. I figure cats are fairly indifferent to name, but my remaining cat has started to follow me everywhere now that his buddy is gone. I've also noticed that they both always prefer the company of women guests than men (they were/are both Toms).