Her

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Old English hire, genitive and dative of hīo, hēo ‘she’.

wiktionary

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From Middle English here, hir, hire, from Old English hire(“her”), from Proto-Germanic *hezōi(dative and genitive singular of *hijō). Cognate with North Frisian hör, Saterland Frisian hier, hiere(“her”), West Frisian har(“her”), Dutch haar(“her”), German Low German hör(“her”), German ihr(“her”).

etymonline

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her (objective case)

Old English hire "her," third person singular feminine dative pronoun, which replaced accusative hie beginning in 10c. See he. Cognate with Old Frisian hiri, Middle Dutch hore, Dutch haar, Old High German iru, German ihr.

her (possessive case)

Old English hire, third person singular feminine genitive form of heo "she" (see she). With absolute form hers.