In Catalan, there is
Xesca (nickname of
Francesca), pronounced ['ʃɛskə] (SHESS-kuh), and adapted in Spanish as
Chesca, pronounced ['tʃeska] (CHAYS-kah).
But, since
Fullmetal Alchemist is a manga serie, the name that the OP had heard is possibly a Japanese name (or a pseudoJapanese name, that is a Japanese name adapted to suit Western sounds).
Lumia
http://onomastica.mailcatala.com