Our cats are purebreds, which means they came with registered names. The late, great The Crazy was sold as Tea-Time Tune, and earned her name by being a neurotic, weird-as-hell mess (but in a cute way).
The BB was sold as Arwen, which actually suited her since she is a genetically and visually flawless, perfect specimen cat who is also petite, dainty, elegant, graceful, fearless, and sweet. But she gradually earned the nickname "BB HBIC" (later shortened to just BB), because when we first got her, she had the adorable habit of surreptitiously following the Crazy around and copying her, but in a tinier, daintier fashion.
Snookums was sold as Russel [sic] Crowe, and when we rescued (bought) him from Crazy Cat Lady Hell where he was being bullied by his 21 overbearing relatives, seeing his name on the papers decided us for sure (the lady had been calling him "Jere", a folksy Finnish dude name that's just as laughably OOC for Snookums as the comparison to Russell Crowe). "It must be fate," we said. "We have to rescue this cat!" Later we came home and followed the real Russell Crowe on Twitter, which we have never regretted, and Snookums, who was hiding in the corner of the sauna literally under his great-grandmother when we first met him, blossomed from a shy, skinny, cringing fraidycat into the pudgy, friendly snugglemonster we know and love. His dedication to snuggling has to be seen to be believed. He ALWAYS is in the mood for snuggles, and there's no kind of squeezing or manhandling him I've come up with that he doesn't enjoy, so his name is an excellent fit.
The bunnies are also purebreds, but when we got them from our buddy pierydys, she advised that if we weren't planning to breed and show them, registering them would be unnecessarily traumatic and expensive, since you have to get their ears tagged to do it. We didn't, and so we had to pick names for them ourselves. Since their sire is named Snickers, we decided on a locally-available candy theme, and we picked popular chocolate caramel Japp bars for the tri-colored one and pink-and-white Rowan-berry-flavored Pihlaja jellies for his ginger-and-white brother. Since we speak English at home, we translated Pihlaja and call him Rowan: unlike Japp, that one doesn't lend itself to anglicized pronunciation.
Since we named the bunnies ourselves, swapping out their names based on personality seems silly, but we actually call Japp "Tiny bunny" or "Tiny bun" more often than anything else. He's just so incredibly smol that when your eyes land on him, exclamations about his smolness sort of reflexively pop out ("HAVE YOU SEEN HOW TINY THE BUNNY IS SITTING ON THIS RUG????") and it's difficult to stop them. He also looks weirdly like a little old man in the face - I think it's the shape of his eyebrow and mustache floof - but nothing pithy to express this has come to us yet.
Ro's descriptive nickname is The Majestic Floof. His personality and behavior is not at all dignified, but his fur is so beautiful and, well, majestic
that he can easily fool you just by posing.
I have not illustrated this post with pictures, but this blog
is completely full of my pet photos if you want to refresh your memory.