Yes. Thel Vadam (Th- ell- Vad- umm) is better than Ripa Moramee
I believe it is "Thel Va-Daum" almost like the word dawn but with an m at the end.
The Arbiter's real name is Thel Vadam' That is the Arbiters name from Halo
The last Arbiter, Thel Vadam, formely Thel Vadamee lives on the Elites or as the covenant call the Sangeilli home world called Sangelios check this on Halopedia it has great information with anything regards to Halo.
The Sangheili home world, Sangheilios, is not featured in Halo 3, or in any other Halo game. It is only mentioned by Rtas 'Vadum when talking to Arbiter Thel 'Vadam.
Thel - opera - was created in 1989.
The Book of Thel was created in 1789.
Thel 'Vandam (Or Thel 'Vandamee).
Mg
thel
West
The River Severn
I don't think that thel is a word, so I am not sure how to pronounce it. However, it looks like it would rhyme with bell, dell, fell, gel, knell, quell, sell, tell, hell, well, and yell.