What Greek word did the Latin word Crispus come from?
the Latin name “Crispus” does not come from any ancient Greek term, simply because it is just the Greek name Κρίσπος that is the transliteration of the Latin name “Crispus” from which it comes, of course.
The Latin name “Crispus”, which derives from the adjective “crispus” (masculine, nominative case) meaning “curly”,” having curled hair”, has been used in ancient Rome as a surname [see the well-known Roman historian Gaius Sallustius Crispus (86 BC – c.35 BC)].
It is in 1 Corinthians 1:14 that we read the name Κρίσπον in the accusative case as a transliteration of the Latin accusative “Crispum”.
See 1 Corinthians 1:14 : "εὐχαριστῶ ὅτι οὐδένα ὑμῶν ἐβάπτισα εἰ μὴ Κρίσπον καὶ Γάϊον" (in ancient Greek) and “Gratias ago Deo, quod neminem vestrum baptizavi, nisi Crispum, et Caium” (in Latin) meaning:"I thank God that I baptized none of you , except Crispus and Gaius").
To conclude, the Latin name “Crispus” does not come from any ancient Greek word.
Please note that you asked me the same question in the category “Ancient Languages” on 07/23/13 and then in the category Ancient/Classical History and I already answered it just like above, since the Latin name “Crispus” does NOT come from any ancient Greek word.