Marwynn \m(a)-rwy-nn\ as a boy's name is a variant of Marvin (Welsh), and the meaning of Marwynn is "sea friend".

The baby name Marwynn sounds like Merwyn, Marwin and Merwinn. Other similar baby names are Garwynn, Berwynn, Carwyn, Corwynn, Derwynn, Darwyn, Erwynn, Garwyn, Mardyn, Marlonn, Marlinn, Martyn, Martenn, Murvynn, Marvyn, Melwynn, Merlynn, Mervynn, Norwynn and Orwynn.