What are some names (for both genders) that could go well with [name_u]River[/name_u]? 
Preferably names with character and a nice meaning…
I’ve been wondering the same thing myself recently.
For girls, personally, I’m in love with the sib-set of [name_u]River[/name_u] and [name_f]Lavender[/name_f]!
But there’s also:
[name_u]River[/name_u] and [name_f]Rose[/name_f],
[name_u]River[/name_u] and [name_f]India[/name_f],
[name_u]River[/name_u] and [name_f]Iris[/name_f],
[name_u]River[/name_u] and [name_f]Hazel[/name_f],
[name_u]River[/name_u] and [name_f]Luna[/name_f],
[name_u]River[/name_u] and [name_f]Juno[/name_f]/[name_f]Juna[/name_f]/[name_f]Junia[/name_f],
[name_u]River[/name_u] and [name_f]Pearl[/name_f],
[name_u]River[/name_u] and [name_f]Lina[/name_f],
[name_u]River[/name_u] and [name_f]Mae[/name_f]/[name_f]Maeve[/name_f],
[name_u]River[/name_u] and [name_f]Freya[/name_f],
[name_u]River[/name_u] and [name_f]Violet[/name_f],
[name_u]River[/name_u] and [name_f]Penelope[/name_f],
[name_u]River[/name_u] and [name_u]Hunter[/name_u] (g),
[name_u]River[/name_u] and [name_m]Apollo[/name_m],
[name_u]River[/name_u] and [name_u]Jules[/name_u],
[name_u]River[/name_u] and [name_u]August[/name_u],
[name_u]River[/name_u] and [name_m]Bodhi[/name_m],
[name_u]River[/name_u] and [name_m]Atlas[/name_m],
[name_u]River[/name_u] and [name_u]Jude[/name_u],
[name_u]River[/name_u] and [name_m]Ezra[/name_m],
[name_u]River[/name_u] and [name_u]Finn[/name_u],
[name_u]River[/name_u] and [name_m]Xander[/name_m]/[name_m]Zander[/name_m],
[name_u]River[/name_u] and [name_m]Xavier[/name_m],
[name_u]River[/name_u] and [name_u]Quinn[/name_u]/[name_u]Quincy[/name_u],
[name_u]River[/name_u] and [name_m]Colt[/name_m]/[name_m]Colton[/name_m],
[name_u]River[/name_u] and [name_u]Indigo[/name_u],
[name_u]River[/name_u] and [name_f]Indie[/name_f],
[name_u]River[/name_u] and [name_u]Mica[/name_u] (the stone),
[name_u]River[/name_u] and [name_m]Jasper[/name_m]/[name_m]Casper[/name_m]/[name_m]Gasper[/name_m],
[name_u]River[/name_u] and [name_u]Rebel[/name_u],
[name_u]River[/name_u] and [name_m]Silas[/name_m],
[name_u]River[/name_u] and [name_m]Beau[/name_m],
[name_u]River[/name_u] and [name_m]Bowen[/name_m],
[name_u]River[/name_u] and [name_m]Cannon[/name_m],
[name_u]River[/name_u] and [name_m]Peregrine[/name_m].
I hope that’s a diverse enough list for you!
Why I’m glad you asked 
One of 11 month old twin boys is named [name_u]River[/name_u]. I went with a subtle water theme. Their older sister is [name_f]Serena[/name_f] and [name_u]River[/name_u]'s twin is [name_u]Dylan[/name_u], which means “son of the sea.” I know [name_u]Dylan[/name_u] is probably too popular of a name for NB, but it is a family name and I love it.
I love the name [name_u]River[/name_u] btw, the more he wears it, the more I love it. His nn is Riv, which sounds great and is very now. My mommy nn for him is Rivie, which may sound silly, but it’s super cute to me
Other water names that I thought were cool and subtle that could match: [name_u]Beck[/name_u] and [name_u]Brennan[/name_u]
I also liked [name_u]Cal/name_u and [name_m]Weston[/name_m] ([name_m]Wes[/name_m]) to go with Riv.
[name_u]River[/name_u] and:
[name_u]Reid[/name_u]
[name_m]Forrest[/name_m]
[name_m]Clay[/name_m]
[name_m]Stone[/name_m]
[name_m]Cole[/name_m]
[name_m]Wyatt[/name_m]
[name_u]Lee[/name_u]
[name_u]Everest[/name_u]