My cat Titus is actually Titus the 2nd. I had a beautiful long-haired black kitten back in about 1972 that I named after Titus Groan, because I had just read Gormenghast (bonus marks if you're old enough to remember when this was trendy.) That kitty lasted less than a year, poor guy, killed on the road.

So, when I adopted my ginger and white guy, he was about a year old, a rescue. His name was Luxor. Not the right name for him, so I immediately changed it to Titus. Lillian Jackson Braun (the "Cat who..." lady) wrote that pet names can define pet personalities. Titus does in fact frown quite a bit, he's a very serious cat, but more affectionate and definitely more vocal than Titus Groan ever was (a dark, brooding, alienated personality).