Colwynn \c(o)-lwy-nn\ as a boy's name is a variant of Colwyn (Welsh). See for meaning of Colwynn.

The baby name Colwynn sounds like Colyn and Colwin. Other similar baby names are Corwynn, Elwynn, Alwynn, Corwyn, Delwynn, Goldwynn, Melwynn, Selwynn and Walwynn.