Are you able to rename Ryder? [Answered: Yes]

As the topic suggests, I believe it's very possible that Scott and Sara's names are set and unchangeable.

In all previous modern Bioware games, promotional material didn't name Sheppard as Jon or Jane. Sheppard was always just Sheppard, Hawke was always just Hawke. The Inquisitor was always the Inquisitor.

However, this time Bioware has released Ryder's names, and has repeated them in a lot of interviews. Even the latest briefing calls them by their first names.

Now, I know the evidence is circumstantial at best, but I would welcome this change. I know that some people would be unhappy with it, but I'd approve. After all, Sheppard's first name was completely customisable... And completely irrelevant. It was really only used to differentiate between save files. Everyone called them "Commander" or "Sheppard," which I find unrealistic. I'm sorry, but if we've worked together for years, or if you've seen me naked, I think you've earned the right to call me by my first name.

It would add a layer of realism if, for example, Cora started the game by calling you 'Ryder,' but as your relationship progressed she started calling your character Scott.