The spelling of the word "ellefsen" can be a bit tricky to understand phonetically. The correct pronunciation is /ˈɛləfsən/, which is written as eh-luhf-suhn. It is derived from a Scandinavian surname meaning son of Olef or Olaf, and has various spellings including Ellifson, Elifson and Elefson. Despite differing spellings, the common feature is the pronunciation of /fs/ as /fsən/. So if you want to spell "ellefsen" correctly, remember to include the silent "e" and the double "s" in the middle.