From Middle English canne, from Old English canne (“glass, container, cup, can”), from Proto-Germanic *kannǭ (“can, tankard, mug, cup”), perhaps from Proto-Indo-European *gan-, *gandʰ- (“a vessel”). Cognate with Scots can (“can”), West Frisian kanne (“a jug, pitcher”), Dutch kan (“pot, mug”), German Kanne (“can, tankard, mug”), Danish kande (“can, mug, a measure”), Swedish kanna (“can, tankard, mug”), Icelandic kanna (“a can”).
From Wiktionary
From Middle English can (first and third person singular of cunnen, connen "to be able, know how") from Old English can(n), first and third person singular of cunnan (“to know how”), from Proto-Germanic *kunnaną, from Proto-Indo-European, *ǵn̥néh₃-. Compare Dutch kunnen, Low German könen, German können, Danish kunne. More at canny, cunning.
From Wiktionary
Middle English first and third person sing. present tense of connen to know how from Old English cunnan gnō- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
Middle English first and third person sing. present tense of connen to know how from Old English cunnan gnō- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
Middle English canne a water container from Old English
From American Heritage Dictionary of the English Language, 5th Edition