[Oh, right, he's probably going to have to start explaining that to people, isn't he. Ren waves a hand.]

Oh, that's an honourific. My culture puts a lot of value on respect and status, so we have terms to put on the end of names that sort of...signify our status compared to others, I guess? It's considered impolite to not use them unless you know someone really well.

[He figures a cultural breakdown would be a bit lost on someone from another planet, and also probably boring for him to try and explain seriously, so he tries to get the point across without sinking them into it too deeply.]