'blocklist' originates from the combination of 'block' and 'list', where 'block' meant 'to obstruct or prevent' and 'list' meant 'a series of items'.

The term 'blocklist' evolved from the concept of 'blacklist', which was used historically to denote a list of people or entities to be shunned or banned.

Initially, it meant 'a list of people to be avoided', but over time it evolved into its current meaning of 'a list of entities denied access to a system'.