Him

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Old English, dative singular form of he, hē ‘he’ and hit ‘it’.

wiktionary

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From Middle English him, from Old English him, from Proto-Germanic *himmai(“to this, to this one”). Cognate with Saterland Frisian him(“him”), West Frisian him(“him”), Sylt North Frisian ham, höm(“him”), Dutch hem(“him”), German Low German hum, hüm, em(“him”), German ihm(“him”, dative).

etymonline

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him (pron.)

Old English him, originally dative masculine and neuter of he, from Proto-Germanic *hi- (see he). Beginning 10c. it replaced hine as masculine accusative, a process completed by 15c. The dative roots of the -m ending are retained in German (ihm) and Dutch (hem). Hine persists, barely, as the southern England dialectal 'un, 'n for "him."