Nothing tricky here, function module MONTH_NAMES_GET is available for that purpose

 DATA:
  month_names TYPE STANDARD TABLE OF t247.  

 CALL FUNCTION 'MONTH_NAMES_GET'
  TABLES
   month_names = month_names
  EXCEPTIONS
   month_names_not_found = 1
   OTHERS = 2.

 IF sy-subrc <> 0.
  RETURN.
 ENDIF.