According to UESP, the rest of the name after a prefix generally starts with a capital letter, e.g. Ra'Jhan, but you can encounter Khajiit NPCs where this isn't the case, e.g. Ra'jiradh. So is this actually some kind of typo, or maybe a 'social language evolution' or just meaningless diversity?
My personal theory would be that, if a name starts capitalized, it's the actual name of the character i.e. Jhan with Ra being the social status while not capitalized it's a version of a full name, Ra'jiradh.
I'm planning to name my Khajiit Raziel but I'm torn between Ra'ziel or Ra'Ziel :shrug: