Phonetic transliteration of an English compound surname like "Fairweather" or "Fairwitz."
费尔 (fèi'ěr) is the standard rendering of "Fair-," then
威 (wēi) for "-wea-/-wi-" and
兹 (zī) for "-ther/-tz." The component
费尔- is reusable for many "Fair-/Phil-" surnames. (The English "fair-weather" idiom — fair-weather friend — does not transfer; this is purely a name transliteration.)