Very obscure German short form of Sofie, not used as a given name in its own right. This is also a Greek short form of Sofia (sometimes transcribed as Fay).
Derived from the Chinese character 菲 (fēi) meaning "fragrant; luxuriant" or 非 (fēi) meaning "not; not be" or 霏 (fēi) meaning "to fall (referred to rain or snow)" or 飛 and 飞 (fēi) meaning "to fly, to float; rapid; swifty; unexpected" or 肥 (féi) meaning "fat, plump". Other characters combinations are also possible.