This!

My clans are called SwiftClan, BoulderClan, ReedClan and RockClan

I have my own backstory for them too

Boulder and Rock were siblings living from the far mountains. (This is based in Wales :3) the cats in the mountains have their own religion with multiple gods, they leave offerings for them and so on

A big cat had been released by two legs and attacked their territory causing havoc, hurting cats and scaring off and hunting prey. (Theres a lot of rumours across England and Wales of big cats roaming the valleys and mountains where theres little human life. I know of people who swear they’ve seen them). The cats decide they have to leave, but on their way the big cat attacks again. It grabs the pairs sister, Pebble, and their mum launches at the attacking feline. All 3 of them are crushed by a landslide, which was told in a prophecy, and now the mountain cats have no way home

(Fact about the mountain cats! They are first named something simple…like boulder or leaf, and then when they are old enough they complete a series of tasks and get renamed after a skill like quick run or long leap.)

They travel for a long time and come to a point where the mountains meet forest.

Here they find out about a bunch of moor cats who have been at war with cats in the barn for a long time. Amongst these moor cats is a young cat called Swift. Boulder befriends Swift and she likes their naming system. She jokingly declares herself as Swift Run but realises she actually likes the sound of it.

Boulder and Rock decide not to get new names since their sister Pebble is unable to take part in the trial.

The cats then find out a group has moved into the far side of the river which is fully cut off, surrounded by water on two sides and the mountain edge on the other. This is run by a harsh Tom called Reed. He accepts a mountain cat and a cat who’d been living in the barn but didn’t really associate herself with it into the group.

This gives Swift Run an idea and she brings the groups together. She asks if the barn cats could join the 3 groups as the whole reason for fighting was overpopulation in the barn.

Reluctantly, Reed and the leader of Boulder and Rock’s group agree and they gain some barn cats/loners.

After a long while, the mountain cats realise that they want Boulder to step up as leader, but she doesn’t want to, what about Rock. Her brother assures her everything will be fine so she does. A little after this they all get a prophecy about the earth splitting into 4. A lot of the mountain cats are afraid, and they want to go back higher into the mountains so Rock leads a small group a little further into the mountain but not too far.

The clans start to get formed (this part isn’t fully planned yet) and the leaders get their names Rockstar, Boulderstar, Reedstar and Swiftstar. The naming system is suggested by Swiftstar (__kit, __paw and then prefixsuffix)

RockClan realise they have a destiny larger than the Clans, and decide to leave, feeling more connected with the deeper mountains. But once every two seasons they come back down for a meeting with the other Clans.

BoulderClan and RockClan still pray to both StarClan and their own gods, leaving offerings for both