I have ancestors from Cornwall so I was quite pleased to find such a pretty Cornish name. Yes, it is similar to LOTR names, which is fine with me, but I think "tree" when I see the name. I like
Elowen Kate and have it on my list, along with other long "a" names,
Elowen Faith and
Elowen Maeve. While I love
Violet,
Elowen Violet reads, for me, as noun noun, "tree" "flower". I do have
Elowen Brooke on my list, and it's "noun" "noun" as well, but I see a tree-lined spring, so it manages to work for me.
Wendy or
Wenda also work as nicknames, but I like the ones you list too.
Some other ideas...
Elowen Gail - makes me think of wind through the trees
Elowen FayeElowen AmyElowen CarysElowen CoraElowen JuliaElowen SophieElowen SadieElowen Tess