This is the 6786th most frequent Catalan word.
sébastien
"Sébastien" is not a Catalan word; it is a French proper noun, typically a first name.
Subject of the sentence, a personal name used nominatively.
Sébastien és un gran músic.
Sébastien is a great musician.
Referenced by name in a conversation context, preceded by appropriate article.
Sempre parlo amb en Sébastien sobre música.
I always talk with Sébastien about music.
Possession indicated by the genitive case, used to describe relationships.