Hither

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Old English hider, of Germanic origin; related to he and here.

wiktionary

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From Old English hider, from Proto-Germanic *hidrê. Cognate with Latin citer.

etymonline

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hither (adv.)

Old English hider, from Proto-Germanic *hithra- (source also of Old Norse heðra "here," Gothic hidre "hither"), from PIE *kitro-, suffixed variant form of root *ko-, the stem of demonstrative pronoun meaning "this" (compare here). Spelling change from -d- to -th- is the same evolution seen in father, etc. Relation to here is the same as that of thither to there.