This is another extremely important aspect of your cat. There are a few more rules when it comes to naming, and here I will outline those and give some prefixes and suffixes.

First, what you can't do.

This is something that drives me up the wall... the cats cannot be named something that they don't know about, except if they're a kittypet/rogue/loner. So no minerals, cats are not geologists, they don't know what diamonds and emeralds are. They don't know what the galaxy and planets are, and they don't know the Twoleg names for seasons. They also do not know what the ocean is. They call it the Sun-Drown Place.

I know people say "Moon is sacred and cannot be used!!!!!" but I'm calling bs. If the Erins were serious about that they wouldn't use it themselves and should've decided that from the beginning. There are multiple canon cats with "moon" in their name and no other cat has ever had an issue with it. Star, however, shouldn't be used, as that is reserved for leaders.

Now, for how to decide your cat's name. I think people get too hung up on having a unique name, but something like Blackfur is completely fine.

Cats are named after their appearance, personality, a combination, or they could be partially named after another cat or something to do with where they were born. I would advise against the first part of your cat's name being personality based as a kit being named wouldn't be old enough for that to be seen, but it does happen sometimes.

I'd also suggest not choosing names with too many syllables, something like Marigoldwhisker is just too much of a mouthful.

Now will list a bunch of prefixes that are possibilities. Just remember, as long as the cats know about it, it's fine. If you have any more prefixes let me know and I'll add them!

For colour/patterns:

Black, Cinder, Soot, Scorch(ed), Dark, Night, Ginger, Bright, White, Grey, Light, Red, Russet, Stripe(d), Spot(ted), Speckle(d), Fleck(ed), Freckle(d), Patch(es), Blue, Gold(en), Tawny, Silver, Pale, Amber, Brindle, Dapple(d), Mottle(d), Splash

Other physical things (fur type, body type, deformities because cats are cruel in naming sometimes, etc):

Spike(d), Sleek, Soft, One, Lost, Silent, Crooked, Small, Little, Tiny, Torn, Broken, Jagged, Half, Kink, Dead, Heavy, Tall, Short, Whisker, Stumpy

Animal names:

Bird, Crow, Raven, Beetle, Heron, Owl, Otter, Fox, Badger, Shrew, Mouse, Rabbit, Bunny, Pigeon, Sparrow, Adder, Snake, Dove, Vole, Sheep, Cow, Minnow, Cod, Salmon, Herring, Squirrel, Jay, Lion, Leopard, Tiger, Buzzard, Lark, Rat, Quail, Kestrel, Starling, Thrush, Robin, Hawk, Ant, Fly, Moth, Wasp, Frog, Newt, Pike, Trout

Plant names:

Holly, Leaf, Oak, Maple, Alder, Pine, Bark, Flower, Daisy, Juniper, Marigold, Rose, Ivy, Berry, Fern, Branch, Briar, Mint, Twig, Yarrow, Ash, Aspen, Birch, Willow, Rowan, Acorn, Apple, Cherry, Nut, Seed, Poppy, Clover, Blossom, Lily, Nettle, Moss(y), Heather, Sedge, Vine, Weed, Oat, Thistle, Hazel, Lichen, Bracken, Bramble, Sorrel

Other nature names:

Flame, Fire, Spark, Dew, Drop, Rain, Sun(ny), Night, Dawn, Dusk, Thunder, Lightning, Shadow,  Sky, Wind, River, Stream, Lake, Blizzard, Cloud, Moon, Snow, Storm, Shade, Morning, Boulder, Flint, Pebble, Stone, Rock, Sand(y), Slate, Meadow, Creek, Fallow, Pool, Honey, Milk, Ripple, Echo, Shell, Smoke, Spring, Hollow, Web

Action names:

Running, Leap(ing), Soaring, Roaring, Swift, Stomp, Crouch, Bounce, Hop, Spring, Fallen, Falling, Mumble, Tumble, Jump(ing), Arch, Splash, Sneeze, Quick, Pounce

Temperament:

Quiet, Loud, Sweet, Silent, Wild

Damn, that's a lot. I'm sure you'll be able to find one to suit your cat that semi-organized mess.

Here we go, suffixes. These are the ones which often are added with skills/personality in mind, but many also just refer to appearance as well. Here's a list sorted by things a cat may be names for. Keep in mind that some are in multiple categories because some can mean multiple things.

Appearance:

Tail, pelt, fur, eye(s), whisker, nose, dapple, mask, speck, spot, stripe, splash, feather, back, belly, foot, leg(s), ear(s), burr, bush, face, mouse, seed, snow

Gentle/kind or motherly:

Flower, feather, berry, briar, bird, brook, cloud, stream, fern, leaf, moon, petal, poppy, song, willow, wish

Playful, energetic:

Blossom, flight, breeze, bright, dust, poppy, shine, skip, slip, song, spring, splash

Good hunter/physical skills:

Nose, ear(s), eye(s), gaze, hawk, breeze, catcher, stalker, leap, pounce, runner, sight, step

Good fighter:

Claw, fang, strike, talon, tooth

Good medicine cat:

Leaf, berry, seed

Cold or mysterious, quiet:

Gaze, branch, frost, cloud, pad, moon, snow, stone, wish, whisper

Brave/courageous:

Heart, light, storm

Passionate:

Blaze, fire, flame, heart

Intelligent, calm:

Creek, dawn, dusk, feather, pool, mist, moon, shade, seed, sight, stone, talon, watcher

Physicality (disabilities, name changes, etc):

Eye(s), ear(s), foot, jaw, scar, tooth, sight

Other (let me know if these fit into a category because I have no idea):

Wing, bee, fall, bark, gorse, thistle

Again, feel free to let me know if there's any I missed! I'd also love to hear your names.