Hello -
In addition to @alexchien's response I'd like to add: as ARIMA creates a common SAS data set one can use utility procedures such as DATASETS to modify attributes such as labels and names. For example if you would like to change both name and label of a variable produced by ARIMA this code snippet might be of interest.
Thanks,
Udo
proc arima data=sashelp.air;
identify var=air(1,12);
estimate q=(1)(12) noint method=ml;
forecast id=date interval=month out=work.want;
run;
proc datasets lib=work memtype=data nodetails nolist;
modify want;
attrib forecast label="Hello World";
rename forecast=MYNAME;
quit;