English
Potterhead
Potter + -head, possibly by analogy with pothead.
Formed from Potter + -head
Proto-Germanic *puttaz ‘pot, jar, tub’
…
Vulgar Latin pottum
Old French pot
Middle English pot ‘a cookpot’
Middle English Potter
English Potter
Today it means
noun One who loves the Harry Potter series of books, the Potterverse, and/or the Wizarding World Rowling-created franchise, especially to a fanatical degree.
Language periods are conventional ranges, not dates for this word.
Etymograph / Potterhead