Fausset's Bible Dictionary
A Christian of Achaia, who with Stephanas and Fortunatus was the bearer of Paul's First Epistle to the Corinthians, and recommended in it to their regard, as one of those who supplied his yearning for Christian fellowship and "refreshed his spirit" (1 Corinthians 16:17-18).
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Fausset, Andrew R. Entry for 'Achaicus'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/a/achaicus.html. 1949.