Magento 2 Custom Order Number - Cynoinfotech
https://www.cynoinfotech.com/product/custom-order-number-magento-2-extension/
Magento 2 Custom Order Number functionality of Order Management Extension you can create informative IDs for orders, shipping, invoices, credit memos. A custom ID number for documentation makes it easy for customers to identify your store and simplifies order management routines for store managers. The Custom Order Number Magento 2 extension enables you to set any initial numbers and prefixes for all types of store documents such as invoices, orders, shipments, credit memos.