Hark

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Middle English: of Germanic origin; related to German horchen, also to hearken.

wiktionary

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From Middle English herken, herkien, from Old English *hercian, *heorcian, *hiercian, ultimately from Proto-Germanic *hauzijaną(“to hear”) + formative/intensive -k (see also the related hīeran, whence English hear). Equivalent to hear +‎ -k. Cognate with Scots herk(“to hark”), North Frisian harke(“to hark”), West Frisian harkje(“to listen”), obsolete Dutch horken(“to hark, listen to”), Middle Low German horken(“to hark”), German horchen(“to hark, harken to”).

etymonline

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hark (v.)

c. 1200, from Old English *heorcian "to hearken, listen," perhaps an intensive form from base of hieran (see hear). Compare talk/tale. Cognate with Old Frisian harkia "listen," Middle Dutch horken, Old High German horechon, German horchen. Used as a hunting cry to call attention. To hark back (1817) originally referred to hounds returning along a track when the scent has been lost, till they find it again (1814). Related: Harked; harking.