ECP is your control panel URL.
APIKEY can be acquired from $ECP/settings/access-tokens.
ORGID can be acquired by API or by browser URL after clicking from $ECP/customers.
NEWNAME is what you want to rename the org to.
export ECP='cp.some.ext'
export APIKEY=123
export ORGID=123
export NEWNAME='new org'
curl -s -X GET https://$ECP/api/orgs/$ORGID -H "Accept: application/json" -H "Authorization: Bearer $APIKEY" | jq .
curl -X 'PATCH' \
'https://$ECP/api/orgs/$ORGID' \
-H "Authorization: Bearer $APIKEY" \
-H 'accept: */*' \
-H 'Content-Type: application/json' \
-d '{
"name": "$NEWNAME"
}'