The old name of iron has several potential answers, depending on the context you are looking for.
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Anglo-Saxon: The word "iron" originated from the Anglo-Saxon word "iren" [1].
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Etruscan: Some linguists believe "iron" may be derived from the Etruscan word "aisar," meaning "gods" [2].
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Latin: The symbol for iron on the periodic table, "Fe", comes from the Latin word "ferrum," meaning "holy metal." This term was linked to iron's use in preparing for crusades [2].
In summary, depending on the context (linguistic origin or historical usage), "iren," "aisar," or "ferrum" could be considered old names for iron.