The crossword solution for the term 'generic surname' is DOE, which is a three-letter word. DOE is a common English surname, derived from the Middle English word 'doh', meaning 'DEER'. It is also used as a given name, and is sometimes used to refer to a female DEER. The surname is most commonly found in the United States, but is also found in other countries such as Canada, Australia, and the United Kingdom.