There *were* others ending in 'WE':
-Curufinwe, Nolofinwe, & Arafinwe (sons of Finwe)
-Ungwe (early 1st name of Ungoliant)
-Valwe (Elf? played some important role in LT)
-Elenwe
-Aranwe & son Voronwe

Concerning the last 3...
Aranwe (aran='king') was of the House of Fingolfin; how?
Was he sister of Elenwe, thus keeping 'WE' in the family?
And what was so 'kingly' about him?
He was father of Voronwe, certainly a special Elf.
Does it have to do with Gondolin, at all?
Voronwe was originally called Bronweg, & there is mention in LT that he is 'mincingly miscalled Voronwe'. Could the name be titular, as well as his father, in honorarium?

Heorrenda