The spelling of the surname "Sandefur" can be explained through IPA phonetic transcription: /ˈsændfər/. The first syllable is pronounced as "sand" with a short "a" sound like in "hat". The second syllable is "fur" with the "u" sound like in "hurt". The "e" in the middle is silent. This spelling is common in the southern United States and is derived from the French name "de la Sande Four" which means "from the sandy furnace".
The surname "Sandefur" is derived from an English place name originating from the Old English words "sande" meaning "sand" and "fyr" meaning "fire". The meaning of the name is often interpreted as "fire on the sand" or "sandy fire". It is likely that the name was originally used to describe someone who lived near a sandy area or dealt with fire on sandy ground, such as a blacksmith or glassblower. Over time, variations of the name, such as "Sanderfur" or "Sanders", may have emerged.