The word "binns" is spelled with a double 'n' at the end, which can be confusing because it is not a common spelling pattern in English. However, the pronunciation of the word gives clues to its spelling. The first syllable of "binns" is pronounced with a short 'i' sound like in "bin", while the second syllable is pronounced with a long 'i' sound like in "beans". This suggests that the double 'n' is necessary to indicate the lengthened vowel sound. The IPA phonetic transcription for "binns" is /bɪnz/.
The etymology of the word binns is unclear, and there doesn't seem to be much information available on its origin. Binns is a surname found largely in the United Kingdom, particularly in areas such as Yorkshire and Lancashire. It could potentially be a variant or a shortened form of the surname Binning or Binnings, which are derived from a place name or a personal name. Without more specific information or historical records, it is difficult to determine the exact etymology of the word binns.