Urn

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late Middle English: from Latin urna ; related to urceus ‘pitcher’.

wiktionary

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From Middle English urne, from Old French urne, from Latin urna(“vessel”).

etymonline

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urn (n.)

late 14c., "large, rounded vase used to preserve the ashes of the dead," from Latin urna "a jar, vessel of baked clay, water-jar; vessel for the ashes of the dead" (also used as a ballot box and for drawing lots), probably from earlier *urc-na, akin to urceus "pitcher, jug," and from the same source as Greek hyrke "earthen vessel." But another theory connects it to Latin urere "to burn" (compare bust (n.1)).