Writer

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Old English wrītere (see write).

wiktionary

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From Middle English writer, writere, from Old English wrītere(“draughtsman; painter; writer; scribe; copyist”) and ġewritere(“writer; composer”), equivalent to write +‎ -er and writ +‎ -er.

etymonline

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writer (n.)

Old English writere "one who can write, clerk; one who produces books or literary compositions," agent noun from writan (see write (v.)). Meaning "sign-painter" is from 1837. Writer's cramp attested by 1843; writer's block by 1950.