Thanks for the suggestion Rosefur and Spiritpelt
Graypaw
Grayfur
Graypelt
Graystripe (familiar)
Graypool (also familiar)
Graystorm
Graywing
Grayfeather
Grayclaw
Grayheart
Graysky
Grayspot
Graybird
Graywhisker
Graynose
Grayleaf
Graypetal
Graywind
Grayfoot
Grayspot
Grayeyes
Grayblaze
Graymist
Grayfire
Grayface
Graystep
Grayfall
Grayleaf