There was only delete -r to delete named range and regular data range variables. New -rn option is added to delete named ranges only.
Syntax
delete -rn [name] [scope] /// name support wildcard, scope can be 0(Sheet), 1(Book), 2(Project)
Number of Named Range deleted will be dumped after executing it.
Examples:
Tip: Use list -rn to view existing named ranges.