Mervyn \m(e)-rv-yn, mer-vyn\ as a boy's name is a variant of Marvin (Welsh) and Mervin (Old Welsh), and the meaning of Mervyn is "sea friend". See also Merlin.

The baby name Mervyn sounds like Marvyn, Murvyn, Mervynn, Merven and Morvyn. Other similar baby names are Kervyn, Merwyn, Melvyn and Merlyn.