Might add, from Nepali similar to Hindi,
Suna made me think of "Gold" (सुन - Soon) or "Listen" (सुन्नु - Sunnu).
Vishwadhar could mean the "World's" (विश्व - Vishva) "Edge" (धार - dhar). I also asked my mother these, and she said this could be something like "throughout the world" or "all around the world".
Silajana is the most straightforward one as everyone mentioned literally would translate to "born of stone" or "Stoneborn".
Prasanva sounds like the prefix (प्र - Pra) which means "front, before, or forward" and "With/Together" (संग - sanga).
I'll take y'all word for Sanvith and Mahik since I can't tease meanings out of those out in Nepali.
So I'll posit the following theory for the etymology of Shri Sanvith Prasanva Mahik va Sila.
Shri is the title for respect, "Lord"
Sanvith is probably his given name meaning "Son of the Mountain".
Prasanva is probably his surname meaning "together from the past". Maybe signifying a long familial connection to the Aethers?
Mahik va Sila is probably a religious title, "Silajana's earthy one". Probably denoting his status as one of Silajana's Aetherbound.
I hope to everyone who doesn't speak a Sanskrit based language, I get across the distinction between words and names. Like in English "Nick" means "The Victory of the People", but while you might be aware of the meaning, you're not actually intending to say like "Hey how are you doing victory of the people" when using a name.
Meanwhile things like "Pope" would be a title which denotes something like "The ordained religious leader of the Catholic Church", and everyone is aware and intends for the full definition to be applied.
This might seem trivial or obvious in English, but I just want to get the framework across when he calls himself Prasanva, the meaning is kind of secondary to the usage (cause it's a name) while I believe Mahik denotes something important.
So all together, the most respectful way to refer to him in English would be as follows: "Lord Sanvith Prasanva the Mahik of Sila(jana), Grand Aetherbound of the Twelve Kingdoms, Raj of the Coriander Court".
P.S. If none of that was confusing, I almost arbitrarily chose the given name, surname, and title just based on what I liked best and made sense to me. For an alternative, his name could be "Prasanva Mahik" and his title would translate to "Son of the mountain, Prasanva Mahik, of Silajana" or any combination of title and name with "Prasanva", "Mahik", and "Sanvith". Or all three could be part of his name, and just "va Sila" is an identifier like "Brightlord".
Most likely Prasanva is part of his name since both himself and his friends call him that, and I don't think you would go around calling yourself "Pope" for instance.