As far as I've ever heard, it's said "EF-lund", though I've seen it spelled so many ways I can't even remember all of them to write here. Here are a few:
Ifflandt, Iffelandt, Eveland, Evland, Ephlin, Ephland, Efland, Eflin, Eafland, Efland, Eafler, Eaflet, Yslant, Efflin, Effland