Beneath

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Old English binithan, bineothan, from bi (see by) + nithan, neothan ‘below’, of Germanic origin; related to nether.

wiktionary

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From Middle English benethe, from Old English bineoþan(“beneath, under, below”), equivalent to be- +‎ neath. Cognate with Low German benedden(“beneath”), Dutch beneden(“beneath, under, down”), obsolete German benieden(“below”).

etymonline

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beneath (adv., prep.)

Old English beneoðan "under, below, in a lower place, further down than," in late Old English "lower in rank, degree, excellence, etc.," from be- "by" + neoðan "below, down, from below," from Proto-Germanic *niþar "lower, farther down, down" (see nether). Meaning "unworthy of" is attested from 1849 (purists prefer below in this sense). "The be- gave or emphasized the notion of 'where,' excluding that of 'whence' pertaining to the simple niðan" [OED].