I don't care for any of those titles.......... mlah. It's your thang, do what ya wanna do...
Sonia = 'wise'
Belmont = 'from the mountainous regions'
Wise people study, and the word 'etude' is both French for 'study' and is a type of musical composition (Rondo, Symphony, Nocturne, Harmony, Aria), so...Castlevania: Etude of the Mountain?
But go with what you feel like.