Stefanie

This name can also be of English usage—in which case, it's pronounced /ˈstɛf.ə.ni/ (STEHF-ə-nee) in English.
This can be seen in the chart.
https://www.behindthename.com/name/stefanie/top/united-states
https://www.behindthename.com/name/stefanie/top/england-wales
https://www.popular-babynames.com/name/stefanie
http://www.nancy.cc/baby-name/stefanie/
https://www.names.org/n/stefanie/about

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I've also found several English bearers of the name. They're all born in the United States of America.
https://en.wikipedia.org/wiki/Stefanie_Powers
https://en.wikipedia.org/wiki/Stefanie_Scott
https://en.wikipedia.org/wiki/Stefanie_Preissner
https://en.wikipedia.org/wiki/Stefanie_Ridel

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Also on a side note, I found one British bearer of the name who uses it as her stage name and her second middle name.
https://en.wikipedia.org/wiki/Stefanie_Martini

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Also of Swedish and possibly Norwegian usage.
https://www.nordicnames.de/wiki/Stefanie

Also Czech: https://cs.m.wikipedia.org/wiki/%C5%A0t%C4%9Bp%C3%A1nka - listed as a variant

Add Usage: Norwegian, English

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Pronounced: steh-FA-nyə (Danish), SHEHF-ə-nee (English)

Stefanie is also the Czech form.