Kean /kean/ [1 syll.] as a name for boys means ancient; fighter; sharp, keen wit or eye. Kean is an alternate form of Cian (Irish, Gaelic).Kean is also a form of Keane (Irish, Gaelic, Old English): actor Edmund Kean. Kreatif forms: Keanna, Keanne.ean /kean/ [1 syll.] as a name for boys means ancient; fighter; sharp, keen wit or eye. Kean is an alternate form of Cian (Irish, Gaelic). Kean is also a form of Keane (Irish, Gaelic, Old English): actor Edmund Kean. Kreatif forms: Keanna, Keanne.