Phonetic transliteration of an English compound surname like 'Fairweather' or 'Fairwitz.'
费尔 is the standard rendering of 'Fair-,' then
威 for '-wea-/-wi-' and
兹 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.