"Winnifrid" is spelled with two "n's" and one "f" because the first syllable is stressed, which requires doubling the "n" to maintain the short "i" sound. The "f" replaces the usual "ph" because the sound is a voiceless labiodental fricative, hence the IPA phonetic transcription [/ˈwɪnɪfrɪd/]. The name has Germanic origins and means "peaceful friend." While it is not a commonly used name, those who choose to use it may appreciate its unique spelling and meaning.
The name Winnifrid or its more common variant Winifred is of Old English origin. It is derived from the elements wine meaning friend and frid meaning peace. Therefore, the name can be interpreted to mean friend of peace or peaceful friend.