Names like

Glittershine
Sparklelight
Sapphirepelt
Oceanwater
Wintersnow
Emeraldeyes
Northsnow
Leafleaf
Featherfeather
Starstar

Let's not forget

Pouncebounce
Appledapple
Fawndawn
Hailtail (Hail the tail)

And the ones that make no sense

Waterfire
Owlhare
Dawndusk
Darklight

I guess you could put meaning behind the last ones, but they don't seem correct at first glance.
Not sure if this is a cliché, but I just wanted to say for fanfics. Not all kittypets have standard names like Harry and Bob. There's creative Twolegs out there who names their pets stuff like Felicia or Nevail or something.

* mm I don't mind these names that much anymore. They're a little silly, yeah, but I don't think anyone is unironically naming cats Leafleaf. I actually do like the name Hailtail and Owlhare. Have fun with your names. I do agree on giving kittypet names just a little extra flavour, though. Who's naming their cats Dan.