So far I have [name]Dylan[/name], [name]Kai[/name], and [name]Caspian[/name].
Any other suggestion?
Names related to water:
[name]Aqua[/name]
[name]Aquarius[/name]
[name]Arno[/name]
[name]Arroyo[/name]
[name]Bay[/name]
[name]Bayou[/name]
[name]Briny[/name]
[name]Brook[/name]
[name]Cascade[/name]
[name]Caspian[/name]
[name]Como[/name]
[name]Cordelia[/name]
[name]Danube[/name]
[name]Delta[/name]
[name]Eddy[/name]
[name]Evian[/name]
Fen
[name]Firth[/name]
[name]Fjord[/name]
[name]Ford[/name]
[name]Glade[/name]
Gully
[name]Harbor[/name]
[name]Hudson[/name]
[name]Jordan[/name]
[name]Kai[/name]
[name]Laguna[/name]
[name]Lake[/name]
[name]Loire[/name]
[name]Lucerne[/name]
[name]Marina[/name]
[name]Marsh[/name]
[name]Misty[/name]
[name]Moor[/name]
[name]Neptune[/name]
[name]Nile[/name]
[name]Oceane[/name]
[name]Po[/name]
[name]Rain[/name]
[name]Raina[/name]
[name]Rainey[/name]
[name]Rana[/name]
[name]Rialta[/name]
[name]Rio[/name]
[name]River[/name]
[name]Tahoe[/name]
[name]Thames[/name]
[name]Wade[/name]
[name]Zambezi[/name]
[name]Zarya[/name]
Names with watery meanings (boys):
[name]Adrian[/name]
[name]Aberdeen[/name]
[name]Bourne[/name]
[name]Clifford[/name]
[name]Coburn[/name]
[name]Deniz[/name]
[name]Conway[/name]
[name]Douglas[/name]
[name]Dylan[/name]
[name]Ford[/name]
[name]Lincoln[/name]
[name]Kendall[/name]
[name]Marlowe[/name]
[name]Marius[/name]
[name]Morrissey[/name]
[name]Muir[/name]
[name]Murphy[/name]
[name]Murray[/name]
[name]Noelani[/name]
[name]Seaton[/name]
Names with watery meanings (girls):
[name]Darya[/name]
Hama
Jurmala
[name]Kendall[/name]
[name]Kai[/name]
[name]Kyle[/name]
[name]Marin[/name]
[name]Maris[/name]
[name]Maya[/name]
[name]Meredith[/name]
[name]Mira[/name]
[name]Morwenna[/name]
[name]Nerida[/name]
[name]Nerissa[/name]
[name]Tallulah[/name]
[name]Tulia[/name]
Derya - ocean
Jinhai - golden sea
[name]Mortimer[/name] - dead sea (not the most optimistic of meanings)
[name]Muir[/name] - sea warrior
[name]Nereus[/name] - “wet one”, a sea god. Other sea gods include [name]Neptune[/name]/[name]Poseidon[/name], Llyr, Aegaeon, Glaucus (the fisherman’s deity), [name]Delphin[/name], [name]Oceanus[/name], Pontus, Proteus, Thaumus, Triton, Mizuchi, Ryujin, Enki, Marduk, [name]Njord[/name], and Volturnus
Uhin - ocean wave
[name]Adrian[/name] - related to the Adriatic Sea
[name]Marius[/name] / Marinus - of the sea
[name]Morrissey[/name] - of the sea or sea action
[name]Murphy[/name] - descendant of a sea warrior
[name]Murray[/name] - settlement by the sea
[name]Morgan[/name] - bright sea or dwells near the sea
Almar - to the sea
[name]Delmar[/name] - from the sea
Leomaris - lion of the sea
[name]Merlin[/name] - sea fortress (and of course the bird)
[name]Merrill[/name] - sparkling sea
[name]Seward[/name] - sea guardian
[name]Zale[/name] - sea strength
Bahari - from the ocean, another bird of prey
Antaeus - son of the earth and sea
[name]Irving[/name] - sea friend
[name]Arnav[/name] - ocean, sea, stream, wave
Avisa - sky, ocean, king, life-giver
Kadhi - receptacle, ocean
Kaimu - ocean dream
[name]Deniz[/name] - sea, ocean
Tadahiro - faithful ocean
Yousuke - ocean meditation
Kalder / [name]Calder[/name] - cold sea, rough waters
[name]Vladimar[/name] - ruler of the ocean
Caspain and [name]Kai[/name] are my favorites though 
[name]Hi[/name]–[name]Just[/name] thought I’d mentioned that [name]Noelani[/name], similar to other Hawaiian names like [name]Leilani[/name], is a girl’s name. It means “heavenly mist.”
[name]Just[/name] a couple more:
[name]Cordelia[/name]
[name]Ondine[/name] (or [name]Undine[/name])
ETA: Oops, just realized this was posted in the boys’ forum.