Daemon Pronunciation: In general IT usage sounds like Demon (US English 'Dee' as in Encyclopaedia pronounced Encyclo 'Pee' dia). According to Wikipedia, the 'Day' pronunciation is used by 'some' (i.e. a minority). From personal industry experience, the US English usage has been and still is in the majority. As late as October 5 2015, please search youtube for 'how to pronounce English words daemon' and review the sound referenced by (ksLlHFIg8L4)