I prefer to name things after the major operation that is done with/to them and what they are if that not coveyed by the type. This is very imporant for strings

I prefer to name things after the major operation that is done with/to them and what they are if that not coveyed by the type. This is very imporant for strings (or array of string, etc) as the type tells you little about what that string is/for. Using your style, variables would be named something like directory_aggregate, filtered_names, etc.