Cay \cay\ as a girl's name is a variant of Catherine (Greek) and Katherine (Greek), and the meaning of Cay is "pure".

The baby name Cay sounds like Cai, Kay, Caye and Gay. Other similar baby names are Bay, Cady, Cal, Cam, Cary, Casy, Cacy, Cas, Caty, Cat, Day, Fay, Jay, May and Ray.