I have tried orders.json?name=#xxxx where xxxx is the order name (a number assigned by shopify client store), but return the last order !
I can understand why tech people have deleted this filter. If I need to retrieve order details, keep in mind the end user know the order name and NOT the order id (this last is used on internal shopify ecosystem only and never disclosed outside), I need to proceed as is:
1) retrieve all orders until I find the order requested (loop,loop loop on a site with thousands orders....)
2) collect the order id
3) retrieve order details
I use lot of cpu/memory on shopify servers for nothing.