This is designed for clans that might exist anywhere, not just the original 5. A note, I stopped reading Warriors halfway through Power of Three. These suffixes are not 100% traditionalist, but I do try to have some logical meaning to things. That is the prefix points to a cat's appearance or circumstances surrounding their birth, and a suffix either speaks to their skills, personality, history or enhances the prefix.
They're gendered because that's important to some people, you don't HAVE to use the gendering, but it's there for people who want it. The only exception is for anything connected to calicos/tortisheshells because of the genetics of cats. I know the Erins have male Calicos and Tortishelles but they also admitted to not doing or caring about doing basic research into cat genetics and growth.
If a word has a synonym that isn't on the list, then that also works as a suffix with the same or similar meaning.
-aster (f)= a petty motherly cat who is laid back and placid