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Spanish word fulano comes from Arabic فلان (So-and-so.)
فلان (Arabic)
So-and-so.
فُلَان (Andalusian Arabic)
fulano (Spanish)
(pejorative) friend, buster, pal, buddy (sarcastic form of address used to warn someone). (pejorative) guy, dude. Alternative letter-case form of Fulano, what's-his-name, so-and-so.