Common elements:
Celon ~ river
Duin ~ (long and large) river
Nen ~ water
Baranduin:
Baran meaning golden-brown and duin meaning river. More commonly known as the Brandywine river.
Celondim:
Celon meaning river and dîm meaning sadness. Possibly River of Sadness.
Falathlorn:
Falath meaning beach or wave-beaten shore and lorn meaning quiet water, anchorage or harbour. Shore of the Quiet Water perhaps.
Nen Harn:
Nen meaning water and harn (from sarn) meaning stone. I’d guess Stone Lake.
Nenuial:
Nen meaning water and uial meaning twilight. More commonly known as Lake Evendim.
(Translations are from the Appendix: Elements in Quenya and Sindarin, The Silmarillion, J.R. R. Tolkien and Hiswelókë’s Sindarin Dictionary. I am not an expert at all – if you see any mistakes please let me know!)
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