The "Universally unique identifier", or UUID, identifies a consistent format for any unique ID to be used. The UUIDs are 128 bit long. UUID v5 is generated by hashing the namespace UUID and the input string/name.
UUID Version 5 (v5) Uniqueness
The UUID v5 is generated by hashing the namespace UUID and input string. UUID v5 makes use of SHA-1 as the hashing algorithm. The UUID v5 is not randomly generated and is always consistent. So a combination of a particular UUID and input string will always be the same. For example namespace UUID 612c8955-7b39-480a-99cb-ffccc3853143 and input string Hello will always generate the same v5 UUID.