Where Did The Slang Word "Stan" Come From?

Stan. Is it a male's given name or slang for a "diehard fan" of BTS or Arya Stark? Both! So how did this word evolve?
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[@michelle2754]

Eminem invented it

[@rodorod]

bro how does this not have more likes?

[@Zedo_v12]

Eminem invented lol

[@LaughgreatYT]

yeah nah eminem’s song “stan” basically invented it