Thistle

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Old English thistel, of Germanic origin; related to Dutch distel and German Distel .

wiktionary

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From Middle English thistel, from Old English þistel, from Proto-Germanic *þistilaz. *þīh- from *teyg-, which is a variant of Proto-Indo-European *(s)teyg-(“to prick”); from this same Proto-Indo-European root comes English stick. Cognates include Scots thrissel, German Distel, Dutch distel and Icelandic þistill.

etymonline

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thistle (n.)

prickly herbaceous plant, Old English þistel, from Proto-Germanic *thistilaz (source also of Old Saxon thistil, Old High German distil, German Distel, Old Norse þistell, Danish tidsel), of uncertain origin; perhaps from an extended form of PIE root *steig- "to prick, stick, pierce." Emblematic of Scotland since 15c.