The fear or belief that someone will accuse you of copying their ideas, personality, or name, even though you haven't done so, is known as "cryptomnesia" or "unintentional plagiarism." Cryptomnesia refers to the phenomenon where a person believes they are coming up with an original idea, but it is actually a memory of something they have previously encountered and forgotten.
This fear can lead to a sense of insecurity and anxiety, and the individual may constantly second-guess their actions or creative endeavors, fearing that they unintentionally copied or plagiarized someone else's work or identity. It is essential to recognize that cryptomnesia is usually unintentional and can happen to anyone due to the complex workings of memory and creativity. If this fear becomes overwhelming or hinders someone's daily life, it may be helpful to seek support from a mental health professional.