Sea names work across cultures because every seafaring tradition named its children for the water. Kai is used as a sea name in Hawaiian, Japanese, and Frisian. Morgan is Welsh for 'sea-born'. Marina and Maris come from Latin, Muir from Scottish Gaelic, and Dylan is Welsh for 'son of the sea'.
An ocean name is a quiet kind of nature name. It does not announce itself; it just carries the sound of water with it wherever the child goes.