I came across the last name "Kills-In-Water". What a vivid name. The first thing I thought of was a human attacking a human in shallow water, which is probably a normal thing (I hope) to think of. The second thing I thought of was some sort of animal, like an alligator. Seems most appropriate, because they lunge onto land to attack land animals and drag them into the water. 

It would be redundant, or at least a little extra, to imagine an animal that already lives entirely in water to have that last name. Hello, Mr. Piranha Kills-In-Water, how are you today? What, you've killed nothing at all on land today? What a shame. Tomorrow, perhaps. Good luck to you then.

The final thing I thought of was a comedian. Because when they do really well and get a lot of laughs during a set, they call it "killing." It would be a pun. The tale of some cursed comedian who has to do their act out of a kiddie pool. Always. Cannot be funny outside of water. Can't even joke. Faces constantly disappointed fans who want to interact with them when they're not in water and come away just...bored entirely.