@Ye_Olde_Crowe is right - names often do not indicate anything. Two guys, Ogrumbu gro-Bugarn and Yagrum Bagarn have very similar names, but the first is an Orc while the second is a Dwemer. There is a theory that the Orcs are the degraded Dwemer, but that is only a theory that has some cons with historical facts. The same way Silman is a traditional Bosmeri name used in Arena and Daggerfall, but as you know it, OP, those names were constructed by using certain prefixes and the name building ways changed since TES III. I'm not aware of any certain information on Ria except that she was a senior apprentice to Jagar Tharn, our tutor in Sorcery and friend. Other information is of a theoretical status. There are some theories that the Staff of Chaos is actually the Staff of Towers, King Anumaril and Umaril the Unfeathered are the same person, that Ria Silmane is Meridia herself, etc., etc.. But these are just theories ..