Vocal

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late Middle English: from Latin vocalis, from vox, voc- (see voice). Current senses of the noun date from the 1920s.

wiktionary

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Late Middle English vocal, borrowed from Latin vōcālis(“uttering a voice, sounding, speaking”), from vōx(“a voice, sound, tone”) +‎ -ālis(“-al”, adjectival suffix). Doublet of vowel and vocalis. Compare Old French vocal.

etymonline

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vocal (adj.)

late 14c., "spoken, oral," from Old French vocal (13c.), from Latin vocalis "sounding, sonorous, speaking," as a noun, "a vowel," from vox (genitive vocis) "voice" (from PIE root *wekw- "to speak"). In reference to music (as opposed to instrumental), first recorded 1580s; meaning "outspoken" first attested 1871. Vocal cords is from 1872; see cord.