Witness

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Old English witnes (see wit1, -ness).

wiktionary

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From Middle English witnesse, from Old English ġewitnes, equivalent to wit +‎ -ness. Cognate with Middle Dutch wetenisse(“witness, testimony”), Old High German gewiznessi(“testimony”), literary German gewissen(“to witness”), Icelandic vitni(“witness”).

etymonline

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witness (n.)

Old English witnes "attestation of fact, event, etc., from personal knowledge;" also "one who so testifies;" originally "knowledge, wit," formed from wit (n.) + -ness. Christian use (late 14c.) is as a literal translation of Greek martys (see martyr). Witness stand is recorded from 1853.

witness (v.)

c. 1300, "bear testimony," from witness (n.). Meaning "affix one's signature to (a document) to establish its identity" is from early 14c. Meaning "see or know by personal presence, observe" is from 1580s. Related: Witnessed; witnessing.