The spelling of the word "drumm" may seem incorrect to some, but it can be explained through IPA phonetic transcription. The double "m" at the end indicates a long vowel sound, specifically the /ɔː/ sound. This spelling could also be influenced by certain dialects or accents. It is important to note, however, that using non-standard spellings can cause confusion and misunderstandings in communication. It is best to stick to standard spellings unless there is a clear reason to use an alternate spelling.
The word "drum" is derived from the Middle English word "drumme", which dates back to the 14th century. Its origin can be traced back to the Old English word "drum", which meant a musical instrument or a large cylindrical vessel. This Old English word was borrowed from the Proto-Germanic word "drumaz". From there, the etymology becomes uncertain, but it is believed to have further origins in the Proto-Indo-European root word "dʰer-", meaning "to buzz, hum, or thrum". This concept of buzzing or thrumming likely reflects the percussive sounds produced by drums.