The The Custom Order Number for Magento 2 extension allows customizing order, invoice, shipment and credit memo numbers to keep your business info private. Bunch of features included such as any combination of letters, numbers and dates/times for all order, invoice, shipment and credit memo, custom increments, length, manual and auto reset the counter and more.

Check more details here : https://www.ulmod.com/custom-order-number-for-magento-2.html