how to rename multiple directory into corresponding file name

I need some help with bash script about rename directory:

I want to rename six directories first in order to conduct analysis:

this is original directory name for rename:

MCIA-1-control_20170509
MCIA-2-control_20170509
MCIA-03-timesport_20170717
MCIA-04-timesport_20170717
MCIA-05-timesport_20170717
MCAI-6-timesport_20170717

I need to rename as following:

subj-1-control
subj-2-control
subj-3-timesport
subj-4-timesport
subj-5-timesport
subj-6-timesport

I already declared several variables as below:

$fnIDs #e.g.MCIA-1-control_20170509... 
$ren ##e.g. 1-control...

then I run this loop, but the results did not as my expect:

for fn in ${fnIDs}; do 
    echo "+++this is all folder name for rename: fnIDs:${fnIDs}+++"
    echo "+++renameing folder: fn:${fn}+++"

    for rn in ${ren}; do
        echo "=======ADD "subj" to rename the subj folder==========="
        refn=subj-"$rn" #e.g. subj-1-control...
        echo "refn:$refn"
        echo "rename folder $fn to $refn"

        if ( test -d "$raw_dir"/"$fn"); then #if dir exist then
            cp -R "$raw_dir"/"$fn" "$raw_dir"/"$refn" #copy and rename file
            echo "cp rename the subj folder:$raw_dir/$refn"
        elif ( test -d "$raw_dir"/"$refn");then
            echo "++++++renamed subject folder already exists+++++++"
            #continue           
        else
            echo "+++++somthing went wrong!Name of subject folder does not exists check "$fn $refn"+++++++++"
            exit
        fi
    done
done

when I execute above script, they doing things as below:

+++renameing folder: fn:MCIA-1-control_20170509+++
=======rename the subj folder===========
renfn:subj-1-control
rename folder MCIA-1-control_20170509 to subj-1-control
rename folder MCIA-1-control_20170509 to subj-2-control

What I want to do is:

rename folder MCIA-1-control_20170509 to subj-1-control
rename folder MCIA-2-control_20170509 to subj-2-control...

Basically, it rename original folder name into six different subj folder name... I got stuck here for a while...

Thanks for help me out...