goth (“dread”) + (m-)baug (“tyrannous, cruel, oppressive”) [Etym. MBAW-] gives the original form as *Gothombauk-.
Sindarin
gothmog
masculine name. Gothmog
Gothmog
noun. tyrannous, oppressive fear
Noldorin
gothmog
masculine name. Voice of Goth
Quenya
Cosmoco
gothmog
Cosmoco _("k")masc. name "Gothmog" (LT2:344)_
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
Gnomish
gothmog
masculine name. Strife-and-hatred
Lord of the Balrogs (S/107) and one of the Nazgûls (LotR/846), this name is a derivation of the roots ᴹ√GOTH “dread” and ᴹ√MBAW “oppress” (Ety/GOS, MBAW).
Conceptual Development: The name G. Gothmog “Strife-and-hatred” dates back to the earliest Lost Tales, where he was the son of Melko(r) (LT2/67). In the Silmarillion drafts from the 1930s, N. Gothmog became the Lord of the Balrogs (LR/117), and in The Etymologies his name was given the derivation described above (Ety/GOS, MBAW). At one point Tolkien considered making it an Orc name meaning “Voice of Goth” (LR/406), but there is no indication this was anything other than a transient idea.