Responses
It's just a variation of Levi's name.
"Rivaille" came from the romanization of his name, リヴァイ, which is "Rivai".
Source: Google (⌒▽⌒)
Ah this comment. Yeah, I realized that a while ago lmao.
Umm, no one's talking about how they said "Captain Rivailli" or smth? Umm..... okay.... that really got me thought cause I was like "who the f is captain Rivailli, I rewatched it just now and I've heard no name like that." Lolololol still was cute and smexy tho.