Calamari

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Italian, plural of calamaro, from medieval Latin calamarium ‘pen case’, from Greek kalamos ‘pen’ (with reference to the squid's long tapering internal shell and its ink). The variant calamares is Spanish.

wiktionary

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Italian calamari, plural of calamaro, from Latin calamarius, from calamus, from Ancient Greek κάλαμος(kálamos, “reed, ink pen”).

etymonline

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calamari (n.)

"squid, type of cuttlefish," 1560s, from Italian calamari, from Latin calamarius, literally "pertaining to a pen," from calamus "a writing pen," literally "reed" (see shawm). So called from the cuttlefish's pen-shaped internal shell and perhaps also from its being full of ink.