Spokesman

google

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early 16th century: formed irregularly from spoke2, on the pattern of words such as craftsman .

wiktionary

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From spoke, past participle of speak + man

etymonline

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spokesman (n.)

1510s, "an interpreter," 1530s in the sense of "person who speaks for another or others." Irregular formation from spoke, past tense of speak (actually a back-formation from spoken) + man (n.). Perhaps on analogy of craftsman. Spokeswoman is from 1650s; spokesperson is from 1972; spokesmodel is attested from 1990.