A common choice of wording for children back in the days. When one person scares another person, the typical thing for them shout is 'BOO!' Back then, "boo" was commonly referred to as the noise a ghost makes. Subsequently, since Arthur does play the role of a mysterious, locked away, child. They gave him the nickname "Boo".
(A silly answer of mine is, try thinking about the Mario Bros. series. Remember that little ghost character named "Boo"?)
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