Here are some:
Rabbitspring
Hareleap
Yellowheart
Tawnypetal
Splashheart
Bluestem
Snowtail
Redfoot
Rosestem
Heartsong
Briarskip
Sweetpoppy
Poppytail
Darkleaf
Dawnspots
Frostbreeze
Lightbrook
Marshhark
Reedfeather
Ravenclaw
Grayspots
Yuuki means brave but I don't know warrior !
Kestrelwing
Emberstrike, Roseblade, and Violetclaw would be fitting warrior names for Amberpaw, Rosepaw, and Purplepaw. Fireheart, Thornfang, and Lavenderstorm are strong and fitting warrior names for Amberpaw, Rosepaw, and Purplepaw. Blazeclaw, Petalfeather, and Shadowwhisker would be powerful warrior names for Amberpaw, Rosepaw, and Purplepaw.
these are really good girl namesmakaylaciaramegansophinasashajasminejazminetahliahbriannashelleycristaldaneshaajaiasiakapriat'anajailentarabriahmeekhiryariyaryanetamikojayzenacarinazaryiaayannakiaradaijakenyachantellezinniquekaylakailalailacaylacailataylorkayleehailey
Flashfoot Fieldpelt Aurafire
Yes, those are suitable warrior names for a gray tabby cat in a fantasy or role-playing setting. They sound unique, nature-inspired, and match well with the cat's fur color and characteristics.
Here a few examples: Destinypool Leafsong Mistyheart Nightheart Featherfur
No canon warrior names begin with 'x'.
The Warrior's Drill
Sky
Sweetbriar, Briarpelt, Hazelpelt/fur, Mousefur/pelt.
FireClanWildClanLeafClanCloudclanMoonClanStormWindClanStormClanBlueClanSilverClanDarkClanArticClanDustClanSnowClanMidnightClanForestClanWoodClanNightclanIceclanStreamclanLotusclanBirdclanWhisperclanMoonclanMidnightclanDuskclanDawnclanAshclanBlackclanSnakeclanBirdclanTreeclanFlowerclanBerryclan