The WooCommerce Sequential Order Numbers Pro plugin allows your store to have sequential, rather than random, order numbers. Additionally you can customize your order numbers by setting a starting number, order number length, and custom prefixes and suffixes. Instead of your order numbers looking like 15, 16, 37, and so on, they could now be WT-01000-UK, WT-01001-UK, or whatever format you prefer!
v.1.18.1