The term ‘hypocorism’ is derived from a Greek word (hypokorism) meaning “to use child-talk.”. So hypocorism is a pet name or nickname or term of endearment used to show affection for a person or object.
For example Mike’ for Michael, Izzy for Isabel or Elizabeth, and the use of familiar terms like these: Will Shakespeare, Jim Boswell, Willie Yeats, Tom Eliot.
It can also be defined as the use of forms of speech imitative of baby talk, especially by an adult.
Also read; A short note on the term Pillow book