I've heard that the period of the Acharonim started with the completion of the Shulchan Aruch. That would technically make Rabbi Yosef Karo the first Acharon. (One should probable research this further.)
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Shmuel Yosef Agnon's birth name is Shmuel Yosef Halevi Czaczkes.
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Yosef is the Hebrew word for Yosef. It's spelled יוסף
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