celon ~ river
nen ~ water
duin ~ (long and large) river
Bruinen, Trollshaws: Brui meaning loud, noisy and nen meaning water. Loud-Water.
Anduin, Lothlórien: And meaning long and duin meaning river. Known as the Great River.
Celebrant, Lothlórien: Celeb meaning silver (particularly of silver deposits) and rant meaning course or riverbed. Watercourse of Silver.
Mitheithel, Ettenmoors: Mith meaning grey and eithel meaning spring or well. Otherwise known as the Hoarwell.
(image from lotro wiki)
(Translations are from the Appendix: Elements in Quenya and Sindarin, The Silmarillion, J.R. R. Tolkien or Hiswelókë’s Sindarin Dictionary. I am not an expert at all – if you see any mistakes please let me know!)