Etymology
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Finn (n.)

"native or inhabitant of Finland; a member of the Finnic race,"  Old English finnas, from Old Norse finnr, the Norsemen's name for the Suomi. Some suggest a connection with fen. Attested in Tacitus as Fenni. Finlander in English is from 1727.

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Fenian (n.)
1816, a modern Irish blend of Old Irish feinne, plural of Fiann, name of a band of semi-legendary Irish warriors + Old Irish Fene, name of the ancient inhabitants of Ireland. In reference to Irish-American brotherhood of that name (founded 1857), attested by 1864.
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