Honestly the only times I've heard
River been used is on a boy xD one in real life (though not an immediate contact so I have no association) and the other being
King River from
Star vs. I think it's one of those great and rare truly genderless names
and omg I so agree with
Wilbur like I get it, I also grew up with
Charlotte's Web (I watched the 70s version a lot), but we don't look at
Charlotte and go "ew I only ever think of spiders with that name" like
Wilbur is a perfectly good name xD I've also never met anybody in real life called
Wilbur and the only fictional uses I've ever seen are on young boys (
Wilbur Robinson from Meet the Robinsons mainly) and
Wilbur the pig, no old men here