GK affirms that ON járn is a loanword from Old Irish. This is an old controversy: Marstrander argued in the strongest terms that it was not: "Utviklingen av ísarn ti iarn er... fællesnordisk og høist sandsynlig utspillet længe før den egentlige vikingetid" (Marstrander 1915: 123).
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Ancestry Diagram
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Map
This map shows the etymological links in a geographic context.