Kieszának miért sz-el írják a nevét?

Fogalmam sincs ki ő, de miért ne?

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Kiesa Rae Ellestad[4][5] (born January 16, 1989),[2][3] better known by her stage name Kiesza,[6] (KYE-zə, /ˈkaɪzə/) is a Canadian singer-songwriter, multi-instrumentalist and dancer from Calgary[7] who has most recently worked out of New York City[8][9][10] and London.[11][12] She is best known for her single "Hideaway".